Journal articles: 'Nonclassical states of light'

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Kim, Kisik. "Variation of nonclassical states of light." Journal of the Korean Physical Society 72, no. 1 (January 2018): 192–95. http://dx.doi.org/10.3938/jkps.72.192.

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Kim, Kisik. "Nonclassical states, measurements, and phenomena of light." Journal of the Korean Physical Society 64, no. 1 (January 2014): 155–58. http://dx.doi.org/10.3938/jkps.64.155.

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Luis, A., and L. L. Sanchez-Soto. "Nonclassical states of light and canonical transformations." Journal of Physics A: Mathematical and General 24, no. 9 (May 1, 1991): 2083–92. http://dx.doi.org/10.1088/0305-4470/24/9/018.

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George, Lijo T., C. Sudheesh, S. Lakshmibala, and V. Balakrishnan. "Ehrenfest’s theorem and nonclassical states of light." Resonance 17, no. 1 (January 2012): 23–32. http://dx.doi.org/10.1007/s12045-012-0004-0.

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George, Lijo T., C. Sudheesh, S. Lakshmibala, and V. Balakrishnan. "Ehrenfest’s theorem and nonclassical states of light." Resonance 17, no. 2 (February 2012): 192–211. http://dx.doi.org/10.1007/s12045-012-0018-7.

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Javed, Sunia, Hadiah Bint Monir, Naila Amir, and Shahid Iqbal. "Engineering nonclassical SU(1,1) coherent states of light by multiphoton excitation." Laser Physics 32, no. 11 (October 7, 2022): 115201. http://dx.doi.org/10.1088/1555-6611/ac92dd.

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Abstract Quantum optical systems with nonclassical features play a vital role in the physical implementation of a large variety of quantum technologies, such as quantum metrology, quantum information processing, and quantum computation protocols, and hence are important to exploit the quantum advantage. In this work, we construct a general class of nonclassical coherent states (CSs) of light and present a scheme to enhance their nonclassicality by multiphoton excitation. In particular, using various optical realizations of s u ( 1 , 1 ) Lie algebra, we construct CSs of light following Barut-Girardello formalism and then perform the multiphoton discrete excitation on these continuous-variable optical CSs. We investigate the nonclassical features by analyzing the photon-counting probability distribution, Mandel Q − parameter, quadrature squeezing, and Wigner quasi-probability distribution. Our numerical results show that, for a particular set of parametric values, these multiphoton excited states exhibit sub-Poisson photon-counting statistics, quadrature squeezing, and negativity of Wigner distribution, which are indicators of nonclassicality. Moreover, it is shown that the nonclassical nature of these states gets enhanced as the photon-excitation number increases.

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Shukla, Pramila, Shivani A. Kumar, and Shefali Kanwar. "Interaction of Light with matter: nonclassical phenomenon." Physics and Chemistry of Solid State 23, no. 1 (January 19, 2022): 5–15. http://dx.doi.org/10.15330/pcss.23.1.5-15.

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Matter and light interaction has very important applications in classical as well as in nonclassical field. In classical mechanics charged particle interact with oscillating field. In quantum mechanics interaction of light is with quantum states. In this paper we review important nonclassical phenomenon and their applications have been observed in last few years.

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Gilles, L., and P. L. Knight. "Two-photon absorption and nonclassical states of light." Physical Review A 48, no. 2 (August 1, 1993): 1582–93. http://dx.doi.org/10.1103/physreva.48.1582.

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Katriel, Jacob, and Allan I. Solomon. "Nonideal lasers, nonclassical light, and deformed photon states." Physical Review A 49, no. 6 (June 1, 1994): 5149–51. http://dx.doi.org/10.1103/physreva.49.5149.

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Horoshko, Dmitri, Stephan De Bièvre, Giuseppe Patera, and Mikhail Kolobov. "Thermal-difference states of light: true states of heralded photons." EPJ Web of Conferences 198 (2019): 00010. http://dx.doi.org/10.1051/epjconf/201919800010.

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We introduce a three-parameter family of single-mode optical states whose density operator is a weighted difference of two thermal states, the thermal-difference states. We identify the parameter values for which these states have a negative non-singular P-function, implying they are nonclassical. We show that the states of the “heralded photons” generated via spontaneous parametric downconversion belong to this family, with the three parameters corresponding to the nonlinear gain and the losses in the signal and the idler channels. The thermal-difference states yield new benchmark states for the analysis of nonclassicality and quantum macroscopicity criteria.

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Mlynek, J., G. Breitenbach, and and S. Schiller. "A Gallery of Quantum States: Tomography of Nonclassical Light." Physica Scripta T76, no. 1 (1998): 98. http://dx.doi.org/10.1238/physica.topical.076a00098.

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Da̧browska, Anita. "Quantum Filtering Equations for a System Driven by Nonclassical Fields." Open Systems & Information Dynamics 25, no. 02 (June 2018): 1850007. http://dx.doi.org/10.1142/s1230161218500075.

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Using Gardiner and Collet’s input-output model and the concept of cascade system, we determine the filtering equation for a quantum system driven by light in some specific nonclassical states. The quantum system and electromagnetic field are described by making use of quantum stochastic unitary evolution. We consider two examples of the nonclassical states of field: a combination of vacuum and single photon states and a mixture of two coherent states. The stochastic evolution conditioned on the results of the photon counting and quadrature measurements is described.

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Rosas-Ortiz, Oscar, and Kevin Zelaya. "Theory of Photon Subtraction for Two-Mode Entangled Light Beams." Quantum Reports 3, no. 3 (September 3, 2021): 500–516. http://dx.doi.org/10.3390/quantum3030033.

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Photon subtraction is useful to produce nonclassical states of light addressed to applications in photonic quantum technologies. After a very accelerated development, this technique makes possible obtaining either single photons or optical cats on demand. However, it lacks theoretical formulation enabling precise predictions for the produced fields. Based on the representation generated by the two-mode SU(2) coherent states, we introduce a model of entangled light beams leading to the subtraction of photons in one of the modes, conditioned to the detection of any photon in the other mode. We show that photon subtraction does not produce nonclassical fields from classical fields. It is also derived a compact expression for the output field from which the calculation of conditional probabilities is straightforward for any input state. Examples include the analysis of squeezed-vacuum and odd-squeezed states. We also show that injecting optical cats into a beam splitter gives rise to entangled states in the Bell representation.

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Dey, Sanjib. "An introductory review on resource theories of generalized nonclassical light." Journal of Physics: Conference Series 2038, no. 1 (October 1, 2021): 012008. http://dx.doi.org/10.1088/1742-6596/2038/1/012008.

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Abstract Quantum resource theory is perhaps the most revolutionary framework that quantum physics has ever experienced. It plays vigorous roles in unifying the quantification methods of a requisite quantum effect as wells as in identifying protocols that optimize its usefulness in a given application in areas ranging from quantum information to computation. Moreover, the resource theories have transmuted radical quantum phenomena like coherence, nonclassicality and entanglement from being just intriguing to being helpful in executing realistic thoughts. A general quantum resource theoretical framework relies on the method of categorization of all possible quantum states into two sets, namely, the free set and the resource set. Associated with the set of free states there is a number of free quantum operations emerging from the natural constraints attributed to the corresponding physical system. Then, the task of quantum resource theory is to discover possible aspects arising from the restricted set of operations as resources. Along with the rapid growth of various resource theories corresponding to standard harmonic oscillator quantum optical states, significant advancement has been expedited along the same direction for generalized quantum optical states. Generalized quantum optical framework strives to bring in several prosperous contemporary ideas including nonlinearity, PT -symmetric non-Hermitian theories, q-deformed bosonic systems, etc., to accomplish similar but elevated objectives of the standard quantum optics and information theories. In this article, we review the developments of nonclassical resource theories of different generalized quantum optical states and their usefulness in the context of quantum information theories.

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Rodríguez-Lara, B. M. "Propagation of nonclassical states of light through one-dimensional photonic lattices." Journal of the Optical Society of America B 31, no. 4 (March 26, 2014): 878. http://dx.doi.org/10.1364/josab.31.000878.

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Tambasco, Jean-Luc, Giacomo Corrielli, Robert J. Chapman, Andrea Crespi, Oded Zilberberg, Roberto Osellame, and Alberto Peruzzo. "Quantum interference of topological states of light." Science Advances 4, no. 9 (September 2018): eaat3187. http://dx.doi.org/10.1126/sciadv.aat3187.

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Topological insulators are materials that have a gapped bulk energy spectrum but contain protected in-gap states appearing at their surface. These states exhibit remarkable properties such as unidirectional propagation and robustness to noise that offer an opportunity to improve the performance and scalability of quantum technologies. For quantum applications, it is essential that the topological states are indistinguishable. We report high-visibility quantum interference of single-photon topological states in an integrated photonic circuit. Two topological boundary states, initially at opposite edges of a coupled waveguide array, are brought into proximity, where they interfere and undergo a beamsplitter operation. We observe Hong-Ou-Mandel interference with 93.1 ± 2.8% visibility, a hallmark nonclassical effect that is at the heart of linear optics–based quantum computation. Our work shows that it is feasible to generate and control highly indistinguishable single-photon topological states, opening pathways to enhanced photonic quantum technology with topological properties, and to study quantum effects in topological materials.

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Cárdenas-López, Francisco, Guillermo Romero, Lucas Lamata, Enrique Solano, and Juan Retamal. "Parity-Assisted Generation of Nonclassical States of Light in Circuit Quantum Electrodynamics." Symmetry 11, no. 3 (March 13, 2019): 372. http://dx.doi.org/10.3390/sym11030372.

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We propose a method to generate nonclassical states of light in multimode microwave cavities. Our approach considers two-photon processes that take place in a system composed of N extended cavities and an ultrastrongly coupled light–matter system. Under specific resonance conditions, our method generates, in a deterministic manner, product states of uncorrelated photon pairs, Bell states, and W states in different modes on the extended cavities. Furthermore, the numerical simulations show that the generation scheme exhibits a collective effect which decreases the generation time in the same proportion as the number of extended cavity increases. Moreover, the entanglement encoded in the photonic states can be transferred towards ancillary two-level systems to generate genuine multipartite entanglement. Finally, we discuss the feasibility of our proposal in circuit quantum electrodynamics. This proposal could be of interest in the context of quantum random number generator, due to the quadratic scaling of the output state.

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Qin, Jiliang, Jialin Cheng, Shaocong Liang, Zhihui Yan, Xiaojun Jia, and Kunchi Peng. "Transferring of Continuous Variable Squeezed States in 20 km Fiber." Applied Sciences 9, no. 12 (June 12, 2019): 2397. http://dx.doi.org/10.3390/app9122397.

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Transferring of a real quantum state in a long-distance channel is an important task in the development of quantum information networks. For greatly suppressing the relative phase fluctuations between the signal beam and the corresponding local oscillator beam, the usual method is to transfer them with time-division and polarization-division multiplexing through the same fiber. But the nonclassical states of light are very sensitive to the channel loss and extra noise, this multiplexing method must bring the extra loss to the quantum state, which may result in the vanishing of its quantum property. Here, we propose and realize a suitable time multiplexing method for the transferring and measurement of nonclassical states. Only the local oscillator beam is chopped into a sequence of light pulses and transmitted through fiber with continuous orthogonal-polarized signal beam. Finally, when the local oscillator pulses are properly time delayed compared to the signal beam, the quantum state can be measured in the time sequences without the influence of extra noise in the fiber. Our work provides a feasible scheme to transfer a quantum state in relative long distance and construct a practical quantum information network in metropolitan region.

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Dey, Sanjib, Andreas Fring, and Véronique Hussin. "Nonclassicality versus entanglement in a noncommutative space." International Journal of Modern Physics B 31, no. 01 (January 10, 2017): 1650248. http://dx.doi.org/10.1142/s0217979216502489.

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Nonclassicality is an interesting property of light having applications in many different contexts of quantum optics, quantum information and computation. Nonclassical states produce substantial amount of reduced noise in optical communications. Furthermore, they often behave as sources of entangled quantum states, which are the most elementary requirement for quantum teleportation. We study various nonclassical properties of coherent states and Schrödinger cat states in a setting of noncommutative space resulting from the generalized uncertainty relation, first, in a complete analytical fashion and, later, by computing their entanglement entropies, which in turn provide supporting arguments behind our analytical results. By using standard theoretical frameworks, they are shown to produce considerably improved squeezing and nonclassicality and, hence, significantly higher amount of entanglement in comparison to the usual quantum mechanical models. Both the nonclassicality and the entanglement can be enhanced further by increasing the noncommutativity of the underlying space. In addition, we find as a by-product some rare explicit minimum uncertainty quadrature and number squeezed states, i.e., ideal squeezed states.

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Boddeda, Rajiv, Quentin Glorieux, Alberto Bramati, and Simon Pigeon. "Generating strong anti-bunching by interfering nonclassical and classical states of light." Journal of Physics B: Atomic, Molecular and Optical Physics 52, no. 21 (October 8, 2019): 215401. http://dx.doi.org/10.1088/1361-6455/ab3e98.

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Sorokin, Arseny A., Gerd Leuchs, Joel F. Corney, Nikolay A. Kalinin, Elena A. Anashkina, and Alexey V. Andrianov. "Towards Quantum Noise Squeezing for 2-Micron Light with Tellurite and Chalcogenide Fibers with Large Kerr Nonlinearity." Mathematics 10, no. 19 (September 23, 2022): 3477. http://dx.doi.org/10.3390/math10193477.

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Squeezed light—nonclassical multiphoton states with fluctuations in one of the quadrature field components below the vacuum level—has found applications in quantum light spectroscopy, quantum telecommunications, quantum computing, precision quantum metrology, detecting gravitational waves, and biological measurements. At present, quantum noise squeezing with optical fiber systems operating in the range near 1.5 μm has been mastered relatively well, but there are no fiber sources of nonclassical squeezed light beyond this range. Silica fibers are not suitable for strong noise suppression for 2 µm continuous-wave (CW) light since their losses dramatically deteriorate the squeezed state of required lengths longer than 100 m. We propose the generation multiphoton states of 2-micron 10-W class CW light with squeezed quantum fluctuations stronger than −15 dB in chalcogenide and tellurite soft glass fibers with large Kerr nonlinearities. Using a realistic theoretical model, we numerically study squeezing for 2-micron light in step-index soft glass fibers by taking into account Kerr nonlinearity, distributed losses, and inelastic light scattering processes. Quantum noise squeezing stronger than −20 dB is numerically attained for a customized As2Se3 fibers with realistic parameters for the optimal fiber lengths shorter than 1 m. For commercial As2S3 and customized tellurite glass fibers, the expected squeezing in the −20–−15 dB range can be reached for fiber lengths of the order of 1 m.

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Julius, R., A.-B. M. A. Ibrahim, A. N. Alias, and M. S. A. Halim. "Squeezed states generation in an array of Linear and Nonlinear Waveguides." Journal of Physics: Conference Series 2075, no. 1 (October 1, 2021): 012001. http://dx.doi.org/10.1088/1742-6596/2075/1/012001.

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Abstract We demonstrate the generation of squeezed states of light due to the second harmonic generation and Kerr effect in an array of nonlinear waveguides mediated through a linear one. We characterized the electromagnetic field by a quantum mechanical Hamiltonian and the density operator time evolution is obtained from the Von-Neumann equation of motion. Using the quasiprobability positive P of phase space representation, the classical Fokker-Planck equation is obtained from the master equation and translated to its classical matching set of nonlinear differential equations. We showed that because of the new possibilities of correlation between the linear and nonlinear channel waveguides, highly nonclassical light may be produced.

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Gevorkyan, S. T. "Formation of Nonclassical States of Light in Media with a Three-Photon Resonance." Optics and Spectroscopy 89, no. 4 (October 2000): 563. http://dx.doi.org/10.1134/1.1319917.

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Gevorkyan, S. T., and V. O. Chaltykyan. "Formation of nonclassical states of light in media with a three-photon resonance." Optics and Spectroscopy 89, no. 4 (October 2000): 563–68. http://dx.doi.org/10.1134/bf03356021.

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Chesi, Giovanni, Alessia Allevi, and Maria Bondani. "Conditional Measurements with Silicon Photomultipliers." Applied Sciences 11, no. 10 (May 17, 2021): 4579. http://dx.doi.org/10.3390/app11104579.

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Nonclassical states of light can be efficiently generated by performing conditional measurements. An experimental setup including Silicon Photomultipliers can currently be implemented for this purpose. However, these devices are affected by correlated noise, the optical cross talk in the first place. Here we explore the effects of cross talk on the conditional states by suitably expanding our existing model for conditional measurements with photon-number-resolving detectors. We assess the nonclassicality of the conditional states by evaluating the Fano factor and provide experimental evidence to support our results.

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Fu, J., X. C. Gao, J. B. Xu, and X. B. Zou. "Exchange of nonclassical properties between two interacting modes of light and mutual conversion of the Fock and coherent states." Canadian Journal of Physics 77, no. 3 (July 1, 1999): 211–20. http://dx.doi.org/10.1139/p99-014.

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The invariant-related unitary transformation method is used to study the exchange of nonclassical properties between two interacting modes of light. With the aid of numerical computation, it is of interest to find that the mutual conversion of the Fock state and the coherent state is attained when the interaction is chosen appropriately.PACS Nos.: 03.65.Ge, 42.50.Ar

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Rai, Atmadev, and Amit Rai. "Transfer of non-classical features and quantum states of light in circularly coupled waveguide arrays." Journal of Optics 24, no. 12 (November 7, 2022): 125801. http://dx.doi.org/10.1088/2040-8986/ac9915.

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Abstract We investigate the applicability of the circular arrays of coupled single-mode optical waveguides in transferring the non-classical state of light for quantum information processing. We study the nonclassical states of light, such as a single-photon Fock state, a two-photon NOON state, a single-mode squeezed state and a two-mode squeezed state as inputs to the lattice, which are key resources for various applications in the field of quantum information science. In addition, for comparison, we also examine a coherent state. We investigate the transport of non-classical features and quantum states of light from one waveguide mode to another. For the single and two-mode squeezed states, we perform a detailed study of the evolution of the squeezing. Our work highlights the potential of the circular arrays of optical waveguides platform for the transport of non-classical features and quantum states of light. We expect our results should have applications in the physical implementation of photonic quantum technologies.

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Hirota, Osamu. "Error Free Quantum Reading by Quasi Bell State of Entangled Coherent States." Quantum Measurements and Quantum Metrology 4, no. 1 (December 20, 2017): 70–73. http://dx.doi.org/10.1515/qmetro-2017-0009.

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AbstractNonclassical states of light field have been exploited to provide marvellous results in quantum information science. Usefulness of nonclassical states in quantum information science depends on whether a physical parameter as a signal is continuous or discrete. Here we present an investigation of the potential of quasi Bell states of entangled coherent states in quantum reading of the classical digital memory which was pioneered by Pirandola (Phys.Rev.Lett.,106,090504,2011). This is a typical example of discrimination for discrete quantum parameters. We show that the quasi Bell state gives the error free performance in the quantum reading that cannot be obtained by any classical state.

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Allevi, Alessia, and Maria Bondani. "Tailoring Asymmetric Lossy Channels to Test the Robustness of Mesoscopic Quantum States of Light." Applied Sciences 10, no. 24 (December 19, 2020): 9094. http://dx.doi.org/10.3390/app10249094.

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In the past twenty years many experiments have demonstrated that quantum states of light can be used for secure data transfer, despite the presence of many noise sources. In this paper we investigate, both theoretically and experimentally, the role played by a statistically-distributed asymmetric amount of loss in the degradation of nonclassical photon-number correlations between the two parties of multimode twin-beam states in the mesoscopic intensity regime. To be as close as possible to realistic scenarios, we consider two different statistical distributions of such a loss, a Gaussian distribution and a log-normal one. The results achieved in the two cases show to what extent the involved parameters, both those connected to loss and those describing the employed states of light, preserve nonclassicality.

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Lenzini, Francesco, Jiri Janousek, Oliver Thearle, Matteo Villa, Ben Haylock, Sachin Kasture, Liang Cui, et al. "Integrated photonic platform for quantum information with continuous variables." Science Advances 4, no. 12 (December 2018): eaat9331. http://dx.doi.org/10.1126/sciadv.aat9331.

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Integrated quantum photonics provides a scalable platform for the generation, manipulation, and detection of optical quantum states by confining light inside miniaturized waveguide circuits. Here, we show the generation, manipulation, and interferometric stage of homodyne detection of nonclassical light on a single device, a key step toward a fully integrated approach to quantum information with continuous variables. We use a dynamically reconfigurable lithium niobate waveguide network to generate and characterize squeezed vacuum and two-mode entangled states, key resources for several quantum communication and computing protocols. We measure a squeezing level of − 1.38 ± 0.04 dB and demonstrate entanglement by verifying an inseparability criterionI= 0.77 ± 0.02 < 1. Our platform can implement all the processes required for optical quantum technology, and its high nonlinearity and fast reconfigurability make it ideal for the realization of quantum computation with time encoded continuous-variable cluster states.

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Zakharov, R. V., and O. V. Tikhonova. "Photon Spatial Properties and Correlations in Nonclassical Squeezed States of Light Carrying the Orbital Moment." Bulletin of the Russian Academy of Sciences: Physics 82, no. 11 (November 2018): 1388–93. http://dx.doi.org/10.3103/s1062873818110254.

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Scheel, Stefan. "Decoherence of nonclassical states of light can be very efficiently used in optical sensor technology." Journal of Modern Optics 50, no. 8 (May 2003): 1327–34. http://dx.doi.org/10.1080/09500340308235207.

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Prokhorov, A. V., A. P. Alodjants, and S. M. Arakelian. "Generation of nonclassical states of light in the Bose-Einstein condensate under electromagnetically induced transparency." Journal of Experimental and Theoretical Physics Letters 80, no. 12 (December 2004): 739–42. http://dx.doi.org/10.1134/1.1868797.

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Allevi, Alessia, and Maria Bondani. "Towards underwater quantum communication in the mesoscopic intensity regime." Optics Express 30, no. 24 (November 17, 2022): 44175. http://dx.doi.org/10.1364/oe.472034.

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The problem of secure underwater communication can take advantage of the exploitation of quantum resources and novel quantum technologies. At variance with the current experiments performed at the single photon level, here we propose a different scenario involving mesoscopic twin-beam states of light and two classes of commercial photon-number-resolving detectors. We prove that twin-beam states remain nonclassical even if the signal propagates in tubes filled with water, while the idler is transmitted in free space. We also demonstrate that from the study of the nonclassicality information about the loss and noise sources affecting the transmission channels can be successfully extracted.

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Amazioug, M., M. Nassik, and N. Habiballah. "Measure of general quantum correlations in optomechanics." International Journal of Quantum Information 16, no. 05 (August 2018): 1850043. http://dx.doi.org/10.1142/s0219749918500430.

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In this paper, we analyze nonclassical correlations between bipartite states in two optomechanical systems. The first system (Sec. 2) consists of two nanoresonators spatially separated by broadband squeezed light, where each cavity has a fixed mirror and a movable one. The second system (Sec. 3) is an atom-optomechanical system consisting of an atomic ensemble placed inside an optical nanoresonator with a vibrating mirror. For both optomechanical systems, we give the Hamiltonian and the explicit expression of covariance matrix leading to the quantum equations describing the dynamic evolution of the system. Then, the nonclassical correlations are quantified using the logarithmic negativity and Gaussian quantum discord. We propose also a scheme for examining the evolution of Gaussian quantum steering and its asymmetry in each system. We show that the entanglement of the two mechanical modes is very strongly related to the parameters characterizing the environment where the movable mirrors evolve, in particular the squeeze parameter, the optomechanical cooperativity and thermal bath temperature.

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Сорокин, А. А., В. В. Дорофеев, С. Е. Моторин, I. Lyashuk, J. Porins, G. Leuchs, and V. Bobrovs. "Формирование неклассических многофотонных состояний света со сжатыми квантовыми флуктуациями в волокнах из модифицированного висмутом теллуритного стекла." Оптика и спектроскопия 130, no. 4 (2022): 544. http://dx.doi.org/10.21883/os.2022.04.52270.54-21.

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An optical fiber with a high Kerr nonlinearity coefficient is proposed and produced from a bismuth-modified tellurite glass for creation of nonclassical multiphoton states of light. Specifically, we propose to use those fibers to squeeze the quantum fluctuations of one of the quadratures of light in the 20 W signal significantly below -10 dB compared to the standard quantum noise limit, which is important for various practical applications. Using numerical modeling based on stochastic nonlinear Schrodinger equation, we demonstrate noise squeezing stronger than -16 dB for lengths of tellurite fiber 6-14 m, while squeezing of -14 dB is expected in silica fibers for lengths of 120-300 m. Analytical formulas were used to analyse the physical factors which limit the squeezing achievable.

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Shahandeh, Farid, and Martin Ringbauer. "Optomechanical state reconstruction and nonclassicality verification beyond the resolved-sideband regime." Quantum 3 (February 25, 2019): 125. http://dx.doi.org/10.22331/q-2019-02-25-125.

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Quantum optomechanics uses optical means to generate and manipulate quantum states of motion of mechanical resonators. This provides an intriguing platform for the study of fundamental physics and the development of novel quantum devices. Yet, the challenge of reconstructing and verifying the quantum state of mechanical systems has remained a major roadblock in the field. Here, we present a novel approach that allows for tomographic reconstruction of the quantum state of a mechanical system without the need for extremely high quality optical cavities. We show that, without relying on the usual state transfer presumption between light an mechanics, the full optomechanical Hamiltonian can be exploited to imprint mechanical tomograms on a strong optical coherent pulse, which can then be read out using well-established techniques. Furthermore, with only a small number of measurements, our method can be used to witness nonclassical features of mechanical systems without requiring full tomography. By relaxing the experimental requirements, our technique thus opens a feasible route towards verifying the quantum state of mechanical resonators and their nonclassical behaviour in a wide range of optomechanical systems.

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Allevi, Alessia, and Maria Bondani. "Preserving Nonclassicality in Noisy Communication Channels." Proceedings 12, no. 1 (June 25, 2019): 3. http://dx.doi.org/10.3390/proceedings2019012003.

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Nowadays, the transmission of quantum information, especially for the distribution of cryptographic keys, is required on a global scale. The main obstacle to overcome in free-space communication is the presence of turbulence, which causes both spatial and temporal deformations of the light signals that code information. Here we investigate the extent at which the transmission of mesoscopic twin-beam states through asymmetric noisy channels degrades the nonclassical nature of the photon-number correlations between signal and idler. We consider three nonclassicality criteria, all written in terms of measurable quantities, and demonstrate, both theoretically and experimentally, that the asymmetry introduced by losses affects the three criteria in different ways.

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Allevi, Alessia, and Maria Bondani. "Feasibility of a Novel Quantum Communication Protocol in Jerlov Type I Water." Entropy 25, no. 1 (December 22, 2022): 16. http://dx.doi.org/10.3390/e25010016.

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Underwater communication based on the use of optical quantum resources has attracted a lot of attention in the last five years due to the potential advantages offered by quantum states of light. In this context, we propose to operate in the mesoscopic intensity regime, where the optical states are well populated and the employed detectors have photon-number resolution. By exploiting these features, we demonstrate that a novel communication protocol based on the experimental quantification of nonclassicality of mesoscopic twin-beam states can be used to transmit binary signals encoded in two single-mode pseudothermal states with different mean values through a Jerlov type I water channel. The experimental results are in perfect agreement with the developed theoretical model, and the feasibility of the protocol is also investigated as a function of the data samples corresponding to each one of the two signals. The good quality of the results encourages a more realistic implementation of the protocol, also exploring the maximum distance at which the quantum states remain nonclassical and thus can be still properly discriminated.

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Abebe, T., Ch Gashu, and E. Mosisa. "Generation of Bright and Entangled Light from a Nondegenerate Three-Level Laser with Parametric Amplifier and Coupled to Thermal Reservoir." Ukrainian Journal of Physics 66, no. 3 (April 7, 2021): 185. http://dx.doi.org/10.15407/ujpe66.3.185.

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The detailed analysis of the two-mode quadrature squeezing and statistical properties of light generated by a nondegenerate three-level laser which has a parametric amplifier and coupled with a thermal reservoir is executed. The combination of the master equation and the stochastic differential equation is presented to study the nonclassical features of the light generated by the quantum system. Moreover, with the aid the resulting solutions together with the correlation properties of noise operators, we calculated the quadrature squeezing, entanglement, and mean number of photon pairs of the cavity light. It is found that the external small-amplitude driving radiation induces a strong correlation between the top and bottom states of three-level atoms to produce a high degree of squeezing. Moreover, the presence of a parametric amplifier is found to enhance the degree of squeezing of the cavity light. We have also established that an increase in the mean thermal photon number appears to degrade the squeezing, but enhances the mean number of photon pairs of the cavity light.

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41

Bendjaballah, C. "Time-interval distributions of a random point process in the detection of classical and nonclassical states of light." Journal of Optics B: Quantum and Semiclassical Optics 5, no. 4 (July 23, 2003): 370–75. http://dx.doi.org/10.1088/1464-4266/5/4/308.

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Lakhfif, Abderrahim, Jamal El Qars, and Mostafa Nassik. "Controlling nonclassical properties of optomechanical systems under the Coulomb interaction effect." International Journal of Quantum Information 18, no. 08 (December 2020): 2150002. http://dx.doi.org/10.1142/s0219749921500027.

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In an optomechanical system consisting of two Fabry–Pérot cavities fed by squeezed light and coupled via Coulomb interaction, we respectively use the logarithmic negativity, Gaussian discord and Gaussian coherence to analyze the behavior of three different indicators of nonclassicality, namely the entanglement, quantum discord and quantum coherence. We perform the rotating wave approximation and work in the resolved sideband regime. In two bi-mode states (optical and mechanical), the coherence is generally found to be greater than entanglement and discord. More interestingly, we show that the Coulomb interaction can be used either to degrade or enhance the nonclassical properties of the optical subsystem. In addition, compared with the discord and coherence, the mechanical entanglement is found strongly sensitive to both thermal and Coulomb effects, and it requires a minimum value of cooperativity to be generated. Remarkably, this minimum increases when increasing the Coulomb coupling strength. Finally, we notice that an optimal transfer of quantum correlations between the optical and mechanical subsystems is achieved in the absence of the Coulomb interaction.

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Pilehvar, Elnaz, Ehsan Amooghorban, and Mohammad Kazem Moravvej-Farshi. "Quantum optical analysis of squeezed state of light through dispersive non-Hermitian optical bilayers." Journal of Optics 24, no. 2 (January 6, 2022): 025201. http://dx.doi.org/10.1088/2040-8986/ac461c.

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Abstract We investigate the propagation of a normally incident squeezed coherent state of light through dispersive non-Hermitian optical bilayers, particularly at a frequency that the bilayers hold parity-time (𝒫𝒯) symmetry. To check the realization of 𝒫𝒯-symmetry in quantum optics, we reveal how dispersion and loss/gain-induced noises and thermal effects in such bilayers can affect quantum features of the incident light, such as squeezing and sub-Poissonian statistics. The numerical results show thermally induced noise at room temperature has an insignificant effect on the propagation properties in these non-Hermitian bilayers. Moreover, tuning the bilayers’ loss/gain strength, we show that the transmitted squeezed coherent states through the structure can retain to some extent their nonclassical characteristics, specifically for the frequencies far from the emission frequency of the gain layer. Furthermore, we demonstrate, only below a critical value of gain, quantum optical effective medium theory can correctly predict the propagation of quantized waves in non-Hermitian and 𝒫𝒯-symmetric bilayers.

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Wang, Zhongjie. "Preparation of dark nonclassical states of the motion of a trapped ion by frequency modulation of the light field." Journal of Physics B: Atomic, Molecular and Optical Physics 40, no. 23 (November 13, 2007): 4471–75. http://dx.doi.org/10.1088/0953-4075/40/23/007.

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Charnukha, A., A. Sternbach, H. T. Stinson, R. Schlereth, C. Brüne, L. W. Molenkamp, and D. N. Basov. "Ultrafast nonlocal collective dynamics of Kane plasmon-polaritons in a narrow-gap semiconductor." Science Advances 5, no. 8 (August 2019): eaau9956. http://dx.doi.org/10.1126/sciadv.aau9956.

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The observation of ultrarelativistic fermions in condensed-matter systems has uncovered a cornucopia of novel phenomenology as well as a potential for effective ultrafast light engineering of new states of matter. While the nonequilibrium properties of two- and three-dimensional (2D and 3D) hexagonal crystals have been studied extensively, our understanding of the photoinduced dynamics in 3D single-valley ultrarelativistic materials is, unexpectedly, lacking. Here, we use ultrafast scanning near-field optical spectroscopy to access and control nonequilibrium large-momentum plasmon-polaritons in thin films of a prototypical narrow-bandgap semiconductor Hg0.81Cd0.19Te. We demonstrate that these collective excitations exhibit distinctly nonclassical scaling with electron density characteristic of the ultrarelativistic Kane regime and experience ultrafast initial relaxation followed by a long-lived highly coherent state. Our observation and ultrafast control of Kane plasmon-polaritons in a semiconducting material using light sources in the standard telecommunications fiber-optics window open a new avenue toward high-bandwidth coherent information processing in next-generation plasmonic circuits.

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Warzecha, Monika, Alastair J. Florence, and Peter G. Vekilov. "The Ambiguous Functions of the Precursors That Enable Nonclassical Modes of Olanzapine Nucleation and Growth." Crystals 11, no. 7 (June 26, 2021): 738. http://dx.doi.org/10.3390/cryst11070738.

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One of the most consequential assumptions of the classical theories of crystal nucleation and growth is the Szilard postulate, which states that molecules from a supersaturated phase join a nucleus or a growing crystal individually. In the last 20 years, observations in complex biological, geological, and engineered environments have brought to light violations of the Szilard rule, whereby molecules assemble into ordered or disordered precursors that then host and promote nucleation or contribute to fast crystal growth. Nonclassical crystallization has risen to a default mode presumed to operate in the majority of the inspected crystallizing systems. In some cases, the existence of precursors in the growth media is admitted as proof for their role in nucleation and growth. With the example of olanzapine, a marketed drug for schizophrenia and bipolar disorder, we demonstrate that molecular assemblies in the solution selectively participate in crystal nucleation and growth. In aqueous and organic solutions, olanzapine assembles into both mesoscopic solute-rich clusters and dimers. The clusters facilitate nucleation of crystals and crystal form transformations. During growth, however, the clusters land on the crystal surface and transform into defects, but do not support step growth. The dimers are present at low concentrations in the supersaturated solution, yet the crystals grow by the association of dimers, and not of the majority monomers. The observations with olanzapine emphasize that detailed studies of the crystal and solution structures and the dynamics of molecular association may empower classical and nonclassical models that advance the understanding of natural crystallization, and support the design and manufacture of promising functional materials.

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GRINBERG, HORACIO. "DYNAMICS AND NONCLASSICAL PHOTON STATISTICS IN THE INTERACTION OF TWO-LEVEL SPIN SYSTEMS WITH A TWO-MODE CAVITY FIELD: A GENERALIZED JAYNES-CUMMINGS MODEL." International Journal of Modern Physics B 22, no. 06 (March 10, 2008): 599–633. http://dx.doi.org/10.1142/s0217979208038867.

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The interaction of a two-level XYn-spin system with a two-mode cavity field is investigated through a generalized Jaynes-Cummings model in the rotating wave approximation. The spontaneous decay of a spin level was treated by considering the interaction of the two-level spin system with the modes of the universe in the vacuum state. The different cases of interest, characterized in terms of a detuning parameter for each mode, which emerge from the nonvanishing of certain commutation relations between interaction picture Hamiltonians associated with each mode, were analytically implemented and numerically discussed for various values of the initial mean photon number and spin-photon coupling constants. Photon distribution, time evolution of the spin population inversion, as well as the statistical properties of the field leading to the possible production of nonclassical states, such as antibunched light and violations of the Cauchy-Schwartz inequality are examined for an excited initial state. It was assumed that the two modes are initially in coherent states and have the same photon distribution. The case of zero detuning of both modes was treated in terms of a linearization of the expansion of the time evolution operator, while in other three cases, the computations were conducted via second- and third-order Dyson perturbation expansion of the time evolution operator matrix elements for the excited and ground states respectively.

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Alodzhants, A. P., G. A. Dzheĭranyan, L. P. Gevorkyan, and S. M. Arakelyan. "Nonclassical states of light in tunnel-coupled optical fibers and possibilities for experimental realization in the beams of low-power high-coherence cw lasers." Quantum Electronics 23, no. 8 (August 31, 1993): 680–84. http://dx.doi.org/10.1070/qe1993v023n08abeh003146.

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Prudêncio, Thiago. "Optical and spin-optical superpositions modulated by Aharonov–Bohm effect." International Journal of Quantum Information 15, no. 04 (June 2017): 1750028. http://dx.doi.org/10.1142/s0219749917500289.

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Generation of Aharonov–Bohm (AB) phase has achieved a state-of-the-art in mesoscopic systems with manipulation and control of the AB effect. The possibility of transfer information encoded in such systems to nonclassical states of light increases the possible scenarios where the information can be manipulated and transferred. In this paper, we propose a quantum transfer of the AB phase generated in a spintronic device, a topological spin transistor (TST), to an quantum optical device, a coherent state superposition in high-Q cavity and discuss optical and spin-optical superpositions in the presence of an AB phase. We demonstrate that the AB phase generated in the TST can be transferred to the coherent state superposition, considering the interaction with the spin state and the quantum optical manipulation of the coherent state superposition. We show that these cases provide examples of two-qubit states modulated by AB effect and that the phase parameter can be used to control the degree of rotation of the qubit state. We also show under a measurement on the spin basis, an optical one-qubit state that can be modulated by the AB effect. In these cases, we consider a dispersive interaction between a coherent state and a spin state with an acquired AB phase and also discuss a dissipative case where a given Lindblad equation is achieved and solved.

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Ilivitskaya, Larisa Gennad'evna. "Diagnostic model of the city: a chronotopic approach." Человек и культура, no. 1 (January 2021): 36–46. http://dx.doi.org/10.25136/2409-8744.2021.1.33303.

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The object of this research is the city viewed as a multilayered semantic phenomenon. The needs of transdisciplinary nature determine the vector of its analysis in light of the possibility of application of diagnostic approach, which incorporates the theoretical and practical aspects, cognitive and transformative sides. The goal consists in the development of diagnostic model of the city as a cultural phenomenon. The position is defended on the limitation of classical diagnostic search applicable to the so-called city. The prospects of its research correlate with the nonclassical interpretation of diagnostics, which views it as methodology of cognition. The basic method of this research is modelling. The development of diagnostic model of the city is founded on M. M. Bakhtin’s concept of chronotope. Namely chronotope is determines as the basic parameter underlying its construct. Incorporating the spatiotemporal parameters of the city and their cultural meanings, it allows recording the temporal-topos configurations in city motion, which reflect various qualitative states of its existence, set by the past, present and future. The author offers a ternary model of the city, consisting of historical-cultural, eventful, and innovative chronotopes. The formulated conclusions indicate that the proposed chronotopes can be viewed separately or following the principle of complementarity, which allows assessing the city from the perspective effective arrangement of urban space, as well as the presence of problematic fields therein.

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Journal articles on the topic 'Nonclassical states of light'

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