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Готові списки джерел за темами / Twin-beam state

Добірка наукової літератури з теми "Twin-beam state"

Автор: Grafiati

Опубліковано: 14 березня 2023

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Статті в журналах з теми "Twin-beam state"

1

D’Ariano, Giacomo M., Michael Vasilyev, and Prem Kumar. "Self-homodyne tomography of a twin-beam state." Physical Review A 58, no. 1 (July 1, 1998): 636–48. http://dx.doi.org/10.1103/physreva.58.636.

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2

D'Ariano, G. M., and M. F. Sacchi. "Equivalence Between Squeezed-State and Twin-Beam Communication Channels." Modern Physics Letters B 11, no. 29 (December 20, 1997): 1263–75. http://dx.doi.org/10.1142/s0217984997001511.

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We show the equivalence between two different communication schemes that employ a couple of modes of the electromagnetic field. One scheme uses unconventional heterodyne detection, with correlated signal and image band modes in a twin-beam state from parametric downconversion. The other scheme is realized through a complex-number coding over quadrature-squeezed states of two uncorrelated modes, each detected by ordinary homodyning. This equivalence concerns all the stages of the communication channel: the encoded state, the optimal amplifier for the channel, the master equation modeling the loss, and the output measurement scheme. The unitary transformation that connects the two communication schemes is realized by a frequency conversion device.

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3

Vasilyev, Michael, Sang-Kyung Choi, Prem Kumar, and G. Mauro D'Ariano. "Tomographic Measurement of Joint Photon Statistics of the Twin-Beam Quantum State." Physical Review Letters 84, no. 11 (March 13, 2000): 2354–57. http://dx.doi.org/10.1103/physrevlett.84.2354.

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4

Allevi, Alessia, Marco Lamperti, Ottavia Jedrkiewicz, Justinas Galinis, Radek Machulka, Ondřej Haderka, Jan Peřina, and Maria Bondani. "Spatio-spectral characterization of twin-beam states of light for quantum state engineering." International Journal of Quantum Information 12, no. 07n08 (November 2014): 1560027. http://dx.doi.org/10.1142/s0219749915600278.

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We present an experimental investigation of the spatio-spectral coherence properties of bright twin-beam states (TWBs) as functions of different parameters, such as pump mean power and tuning angle of the employed nonlinear crystal. Our attention is mainly focused on the possible relations among the different quantities under investigation. Particular attention is devoted to the evolution of the number of spatio-spectral modes describing the radiation field, as it represents an interesting property to be controlled in view of possible applications to quantum state engineering protocols.

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5

Chesi, Giovanni, Alessia Allevi, and Maria Bondani. "Autocorrelation functions: a useful tool for both state and detector characterisation." Quantum Measurements and Quantum Metrology 6, no. 1 (January 1, 2019): 1–6. http://dx.doi.org/10.1515/qmetro-2019-0001.

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Abstract The calculation of autocorrelation functions represents a routinely used tool to characterise quantum states of light. In this paper, we evaluate the g(2) function for detected photons in the case of mesoscopic multi-mode twin-beam states in order to fully investigate their statistical properties starting from measurable quantities. Moreover, we show that the second-order autocorrelation function is also useful to estimate the spurious effects affecting the employed Silicon-photomultiplier detectors.

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6

Galinis, Justinas, and Ondřej Haderka. "Propagation of the twin-beam state from the near field to the far field." Journal of the Optical Society of America B 34, no. 11 (October 26, 2017): 2406. http://dx.doi.org/10.1364/josab.34.002406.

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7

Narabadeesuphakorn, Phisut, Jirayu Supasil, Supachok Thainoi, Aniwat Tandaechanurat, Suwit Kiravittaya, Noppadon Nuntawong, Suwat Sopitopan, Songphol Kanjanachuchai, Somchai Ratanathammaphan, and Somsak Panyakeow. "Growth Control of Twin InSb/GaAs Nano-Stripes by Molecular Beam Epitaxy." MRS Advances 2, no. 51 (2017): 2943–49. http://dx.doi.org/10.1557/adv.2017.510.

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ABSTRACTInSb has been considered as a promising material for spintronic applications owing to its pronounced spin effects as a result of large intrinsic electronic g-factor. In addition, embedding InSb quantum nanostructures in a GaAs matrix could create type-II band alignment, where radiation lifetimes are longer than those of the typical type-I systems. Such characteristics are promising for memory devices and infrared photonic applications. The growth of InSb/GaAs quantum nanostructures by strain driven mechanism using molecular beam epitaxy with low growth temperature, slow growth rate, Sb soaking process prior to In deposition, and small amount of In deposition typically creates a mixture of twin and single nano-stripe structures with truncated pyramid shape. In this work, we further investigate the growth mechanism of such twin InSb/GaAs nano-stripes by controlling the growth conditions, consisting of nanostructure growth duration and growth temperature. When the growth temperature is kept to less than 300°C and In deposition is set to only a few monolayers, we found that 25-40% of formed nanostructures are twin InSb/GaAs nano-stripes. However, when the In deposition is stopped immediately after the spotty reflection high-energy electron diffraction patterns are observed, the ratio of twin nano-stripes to single ones is increased to 50-60%. We therefore describe the growth mechanism of twin nano-stripes as the early state of single nano-stripe formation, where the twin nano-stripes are initially formed during the first monolayer of InSb formation as a result of large lattice mismatch of 14.6%. When In deposition is increased to a few monolayers, the gap between twin nano-stripes is filled up and consequently forms the single nano-stripes instead. With this particular twin nano-stripe growth mechanism, the preservation of high ratio of twin nano-stripe formation can be expected by further reducing the growth temperature, i.e. less than 260°C. These twin nano-stripes may find applications in the fields of spintronics and novel interference nano-devices.

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8

Xie, Mengyu, Haoran Zhang, Zaisheng Lin, and Gui-Lu Long. "Implementation of a twin-beam state-based clock synchronization system with dispersion-free HOM feedback." Optics Express 29, no. 18 (August 20, 2021): 28607. http://dx.doi.org/10.1364/oe.434386.

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9

Grajcar, A., B. Grzegorczyk, M. Różański, S. Stano, and M. Morawiec. "Microstructural Aspects of Bifocal Laser Welding of Trip Steels." Archives of Metallurgy and Materials 62, no. 2 (June 1, 2017): 611–18. http://dx.doi.org/10.1515/amm-2017-0090.

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AbstractThis work is concerned with comparative tests involving single-spot and twin-spot laser welding of thermomechanically rolled TRIP steel. The welding tests were carried out using keyhole welding and a solid state laser. In the case of twin-spot laser beam welding, the power distribution of beams was 50%:50%. The changes in macro- and microstructures were investigated using light and scanning electron microscopy. Three main zones subjected to the tests included the fusion zone, the heat affected zone and the intercritical heat affected zone (transition zone between the base material and the HAZ). Special attention was paid to the effect of various thermal cycles on the microstructure of each zone and on martensite morphology. The tests involved hardness measurements carried out in order to investigate the effect of different microstructures on mechanical properties of welds.

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10

Zhang, Yun, Katsuyuki Kasai, and Masayoshi Watanabe. "Experimental investigation of the intensity fluctuation joint probability and conditional distributions of the twin-beam quantum state." Optics Express 11, no. 1 (January 13, 2003): 14. http://dx.doi.org/10.1364/oe.11.000014.

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Більше джерел

Дисертації з теми "Twin-beam state"

1

LOSERO, ELENA. "Quantum enhanced optical measurements." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2841168.

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Тези доповідей конференцій з теми "Twin-beam state"

1

Gallo, Katia, Martin Levenius, Fredrik Laurell, and Valdas Pasiskevicius. "Twin-beam optical parametric generation in nonlinear photonic crystals." In Advanced Solid-State Photonics. Washington, D.C.: OSA, 2011. http://dx.doi.org/10.1364/assp.2011.ama2.

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2

Ogasawara, N., G. P. Li, Y. Ichimura, T. Kobayashi, Y. Kimura, S. Fukatsu, Y. Shiraki, and R. Ito. "Beam Deflection and Mode Switching Characteristics in Coupled Twin-Stripe Lasers." In 1991 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 1991. http://dx.doi.org/10.7567/ssdm.1991.pc3-8.

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3

Huang, Jianming, and Prem Kumar. "Observation of quantum frequency conversion." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.pd17.

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Анотація:

Quantum frequency conversion,1 a process with which one beam of light can be converted into another of a different frequency while preserving the quantum state, is experimentally demonstrated. An implementation of quantum frequency conversion requires that an input beam to a sum-frequency generator be completely up-converted. One needs to generate a quantum state (e.g., a squeezed state or a twin- beam state) at one frequency and then show that the properties of the same state appear at the up-converted frequency. We have chosen to use nonclassical intensity correlation of the twin beams as the input quantum property because large correlations can be easily obtained by pumping an optical parametric amplifier with a mode-locked and Q-switched laser.2 After one of the twin beams is up-converted, nonclassical intensity correlations appear between the up-converted beam and the remaining twin beam. In our experiment the 1064nm output signal beam of the parametric amplifier, possessing >3 dB nonclassical intensity correlation with the 1064nm output idler beam, is up-converted into a 532nm beam. The 532nm beam shows >2 dB nonclassical correlation with the 1064nm idler beam, demonstrating the quantum frequency conversion process.

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4

Yeh, W. Y., A. H. Pham, and S. Morito. "Twin Formation in One Dimensional crystal growth of Si Thin Film During Micro Chevron Laser Beam Scanning." In 2019 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2019. http://dx.doi.org/10.7567/ssdm.2019.ps-10-09.

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5

Huang, Jianming, Orhan Aytür, and Prem Kumar. "Sub-shot-noise measurements with pulsed twin beams of light." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.mc4.

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Recently, we have observed as much as 7 dB of quantum-noise reduction in the direct difference detection of twin-beam signal and idler outputs from a traveling-wave optical parametric amplifier (OPA).1 The OPA, which consists of a type-II phase-matched KTiOPO4 crystal, is pumped by the second harmonic of a mode-locked and Q-switched Nd:YAG laser. Here we describe an experiment in which we used these twin-beam pulses to improve on the optimal (shot-noise-limited) direct-detection signal-to-noise ratio (SNR) that can be achieved with coherent-state pulses of light of the same peak power.

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6

Muhammed, Ameen R. A., and Dara W. Childs. "Rotordynamics of a 2-Phase Flow Twin Screw Pump." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69965.

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Twin-screw pumps are positive displacement machines. Two meshing screws connected by timing gears push the fluid trapped in the screw cavities axially from suction to discharge. Available steady state hydraulic models predict pump performance and axial pressure distribution in the chambers in single and two phase flow conditions. However, no model is available for their rotordynamics. Due to the helix angle of the screw, the pressure distribution around the rotor is not balanced; giving rise to both static and dynamic lateral forces. The work presented here introduces a starting point for rotordynamic analysis of twin screw-pumps. We first show that the screw rotors geometry can be represented by axisymmetric beam elements. Second, we extend the steady state hydraulic model to predict both the static and dynamic lateral forces resulting from the unbalanced pressure field. Finally, hydraulic forces are applied to the rotor to predict static, synchronous and nonsynchronous responses. Predictions of the dynamic pressure were compared to measurements from the literature and were found to be in good agreement.

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7

Reid, M. D., W. Munro, and B. Sanders. "Macroscopic quantum states generated by twin-beam systems." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.wl14.

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Nondegenerate parametric oscillation and four-wave mixing generate correlated twin-beams that exhibit squeezing in the intensity difference fluctuations. Using a simple theoretical model for parametric amplification we predict that the twin-beam devices generate macroscopic states that violate Bell’s inequality. In four-wave mixing, or parametric oscillation with an amplitude-squeezed pump, the twin-beams may also exhibit squeezing in the intensity of each beam. We predict that the use of these intensity-squeezed devices is advantageous in the preparation of the macroscopic quantum states. It is also possible to use nondegenerate systems to generate macroscopic superposition (Schrodinger cat) states.

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8

Hatano, Satoshi, Takashige Omatsu, Akira Hasegawa, Mitsuhiro Tateda, and Iwao Ogura. "High spatial and temporal coherent output from a broad-stripe laser diode with phase conjugate feedback." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cwo4.

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We report the first demonstration, to our knowledge, of high bright output with low M2 and narrow linewidth from a broad-stripe laser diode (BS-LD) with a phase conjugate feedback. Fig. 1 is the experimental setup. A 1W-class BS-LD (SONY SLD304), whose polarization is parallel to die y-axis in Fig.1, is mounted onto heat sink. The output of BS-LD is collimated and passes through a half wave plate, which rotates the polarization by 90°, so that the polarization of BS-LD lies in an undoped BaTiO3 extra-ordinary plane. One-half of BS-LD beam is out-coupled by a prism mirror placed in the far field, and the other is focused onto the BaTiO3. The BaTiO3 has dimensions of 5mm × 6mm × 7mm, and operates as a self-pumped CAT phase conjugator. The free-running BS-LD had 1.5nm line-width (FWHM) and poor beam quality of Mx2~5 and My2>100 in the directions along the x and y-axes. After the BS-LD switching on, the phase conjugator turned on within 10minutes. After an additional 5-10minutes, the system reached a steady state and the line-width of BS-LD had narrowed to less than 0.3nm (Fig.2). The out-coupled beam, which was focused by a lens with the focal length of 100mm, is shown in Fig.3. Its Mx2 and My2 factors had reduced to less than 20% and 35% compared with them at free-running. And then, out-coupled power still exceeded 50% of the total lasing power of BS-LD. It means that the focused output beam should have 7 times higher brightness than at free-running. Previously beam-clean-up of a high-power-array-laser-diode with phase conjugate feedback has been reported. In previous reports, because the phase conjugator works not as spatial filter but just as self-alignment external feedback mirror, an additional spatial filter was required for picking off one-half of twin-lobe output in far-field. Our technique is very different from previous ones, because it required no element such as the spatial filter for improving beam quality and narrowing the lasing frequency in BS-LD apart from the external phase conjugator. We therefore conclude that the BS-LD with phase-conjugate feedback is an effective source for pumping solid state laser materials at high efficiency.

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9

Yuen, Horace P. "Number states, twin beams, and photon duplication." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.mo1.

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It has been known for a while that coherent high-intensity photon number eigenstate fields can be generated through nonlinear optical parametric processes,1 the same ones that give rise to quadrature squeezing.2,3 In contrast to quadrature squeezing which is essentially a single-mode phenomenon, although it is widely misunderstood that it is a two-mode phenomenon, the generation of single-mode number states through three- or four-wave mixing depends on two separate signal and idler modes that are perfectly correlated in photon numbers, in other words a twin beam. The nature of such twin beams is elucidated in both the Schrodinger and the Heisenberg pictures. In particular, it is shown that strong photon number correlation in a twin beam can still be obtained in an amplifier rather than an oscillator configuration, another widely missed point.

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10

Allevi, Alessia, Ottavia Jedrkiewicz, Ondřej Haderka, Jan Peřina, and Maria Bondani. "Evolution of spatio-spectral coherence properties of twin beam states in the high-gain regime." In SPIE Optics + Optoelectronics, edited by Konrad Banaszek and Christine Silberhorn. SPIE, 2015. http://dx.doi.org/10.1117/12.2178952.

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