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Статті в журналах з теми "Single-Photon wavepackets"

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Автор: Grafiati

Опубліковано: 7 липня 2024

Оновлено: 7 липня 2024

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Rag, Hemlin Swaran, and Julio Gea-Banacloche. "Atomic population transfer for single- and N-photon wavepackets." Journal of the Optical Society of America B 38, no. 1 (December 17, 2020): 226. http://dx.doi.org/10.1364/josab.410808.

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Hayat, Alex, Xingxing Xing, Amir Feizpour, and Aephraim M. Steinberg. "Multidimensional quantum information based on single-photon temporal wavepackets." Optics Express 20, no. 28 (December 17, 2012): 29174. http://dx.doi.org/10.1364/oe.20.029174.

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Contopoulos, Ioannis, Athanasios C. Tzemos, Foivos Zanias, and George Contopoulos. "Interference with Non-Interacting Free Particles and a Special Type of Detector." Particles 6, no. 1 (January 17, 2023): 121–33. http://dx.doi.org/10.3390/particles6010005.

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This paper demonstrates how a classical detector that collects non-interacting individual classical massive free particles can generate a quantum interference pattern. The proposed classical picture requires that particles carry the information of a phase equal to an action integral along their trajectory. At the point of their detection, a special type of detector collects the phases from all individual particles reaching it, adds them up over time as complex numbers, and divides them by the square root of their number. The detector announces a number of detections equal to the square of the amplitude of the resulting complex number. An interference pattern is gradually built from the collection of particle phases in the detection bins of the detector after several repetitions of the experiment. We obtain perfect agreement with three solutions of the Schrödinger equation for free particles: a Gaussian wavepacket, two Gaussian wavepackets approaching each other, and a Gaussian wavepacket reflecting off a wall. The main conclusion of the present work is that the interference of quantum mechanics is basically due to the detectors that collect the particles when there are macroscopic detectors operating as proposed. Finally, a simple physical experiment with a single-photon detector is proposed that will be able to test our theory.

Deng, Fu-Guo, Xi-Han Li, and Hong-Yu Zhou. "Passively self-error-rejecting qubit transmission over a collective-noise channel." Quantum Information and Computation 11, no. 11&12 (November 2011): 913–24. http://dx.doi.org/10.26421/qic11.11-12-2.

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We propose a passively self-error-rejecting single-qubit transmission scheme for an arbitrary polarization state of a single qubit over a collective-noise channel, without resorting to additional qubits and entanglement. By splitting a single qubit into some wavepackets with some Mach-Zehnder interferometers, we can obtain an uncorrupted state with a success probability approaching 100% via postselection in different time bins, independent of the parameters of collective noise. It is simpler and more flexible than the schemes utilizing decoherence-free subspace and those with additional qubits. One can directly apply this scheme to almost all quantum communication protocols based on single photons or entangled photon systems against a collective noise.

Mansuripur, Masud, and Ewan M. Wright. "Fundamental properties of beamsplitters in classical and quantum optics." American Journal of Physics 91, no. 4 (April 2023): 298–306. http://dx.doi.org/10.1119/5.0102760.

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A lossless beamsplitter has certain (complex-valued) probability amplitudes for sending an incoming photon into one of two possible directions. We use elementary laws of classical and quantum optics to obtain general relations among the magnitudes and phases of these probability amplitudes. Proceeding to examine a pair of (nearly) single-mode wavepackets in the number-states [Formula: see text] and [Formula: see text] that simultaneously arrive at the splitter's input ports, we find the distribution of photon-number states at the output ports using an argument inspired by Feynman's scattering analysis of indistinguishable Bose particles. The result thus obtained coincides with that of the standard quantum-optical treatment of beamsplitters via annihilation and creation operators [Formula: see text] and [Formula: see text]. A simple application of the Feynman method provides a form of justification for the Bose enhancement implicit in the well-known formulas [Formula: see text] and [Formula: see text].

Cardano, Filippo, Francesco Massa, Hammam Qassim, Ebrahim Karimi, Sergei Slussarenko, Domenico Paparo, Corrado de Lisio, et al. "Quantum walks and wavepacket dynamics on a lattice with twisted photons." Science Advances 1, no. 2 (March 2015): e1500087. http://dx.doi.org/10.1126/sciadv.1500087.

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The “quantum walk” has emerged recently as a paradigmatic process for the dynamic simulation of complex quantum systems, entanglement production and quantum computation. Hitherto, photonic implementations of quantum walks have mainly been based on multipath interferometric schemes in real space. We report the experimental realization of a discrete quantum walk taking place in the orbital angular momentum space of light, both for a single photon and for two simultaneous photons. In contrast to previous implementations, the whole process develops in a single light beam, with no need of interferometers; it requires optical resources scaling linearly with the number of steps; and it allows flexible control of input and output superposition states. Exploiting the latter property, we explored the system band structure in momentum space and the associated spin-orbit topological features by simulating the quantum dynamics of Gaussian wavepackets. Our demonstration introduces a novel versatile photonic platform for quantum simulations.

Ren, Xi-Feng, Guo-Ping Guo, Yun-Feng Huang, Zhi-Wei Wang, and Guang-Can Guo. "Plasmon assisted transmission of single photon wavepacket." Metamaterials 1, no. 2 (December 2007): 106–9. http://dx.doi.org/10.1016/j.metmat.2007.09.004.

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Decleva, Piero, Mauro Stener, and Daniele Toffoli. "Continuum Electronic States: The Tiresia Code." Molecules 27, no. 6 (March 21, 2022): 2026. http://dx.doi.org/10.3390/molecules27062026.

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A multicenter (LCAO) B-spline basis is described in detail, and its capabilities concerning affording convergent solutions for electronic continuum states and wavepacket propagation are presented. It forms the core of the Tiresia code, which implements static-DFT and TDDFT hamiltonians, as well as single channel Dyson-DFT and Dyson-TDDFT descriptions to include correlation in the bound states. Together they afford accurate and computationally efficient descriptions of photoionization properties of complex systems, both in the single photon and strong field environments. A number of examples are provided.

Monken, C. H., and G. A. Barbosa. "Temporal response of a Fabry-Pérot cavity to a single-photon wavepacket." Optics Communications 99, no. 3-4 (June 1993): 152–56. http://dx.doi.org/10.1016/0030-4018(93)90070-l.

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Marzlin, Karl-Peter, and Michael P. Kinach. "Exactly solvable 2D model for photon propagation in curved space: loss of interference and Bell inequality violation." Classical and Quantum Gravity 39, no. 6 (February 28, 2022): 065005. http://dx.doi.org/10.1088/1361-6382/ac4fbb.

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Abstract We present an exact solution for the propagation of quantized massless scalar particles in a two-dimensional variation of the Alcubierre metric. Classical localized wavepacket solutions are derived using closed expressions for light-ray coordinates, and corresponding annihilation operators are constructed using the concept of locally positive and negative frequencies. The theory is used to describe the loss of fringe visibility in a single-photon interferometer, and the reduction of entanglement between two 2D photons, if one photon travels through a region with spacetime curvature. We derive an expansion of the field operator in terms of localized modes by means of an over-completeness relation. The quantization procedure also applies to massive and charged scalar fields in an n-dimensional globally hyperbolic spacetime.

Brezinski, Mark E. "The Advantages of Not Entangling Macroscopic Diamonds at Room Temperature." Journal of Atomic, Molecular, and Optical Physics 2012 (December 27, 2012): 1–9. http://dx.doi.org/10.1155/2012/469043.

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The recent paper entitled by K. C. Lee et al. (2011) establishes nonlocal macroscopic quantum correlations, which they term “entanglement”, under ambient conditions. Photon(s)-phonon entanglements are established within each interferometer arm. However, our analysis demonstrates, the phonon fields between arms become correlated as a result of single-photon wavepacket path indistinguishability, not true nonlocal entanglement. We also note that a coherence expansion (as opposed to decoherence) resulted from local entanglement which was not recognized. It occurred from nearly identical Raman scattering in each arm (importantly not meeting the Born and Markovian approximations). The ability to establish nonlocal macroscopic quantum correlations through path indistinguishability rather than entanglement offers the opportunity to greatly expand quantum macroscopic theory and application, even though it was not true nonlocal entanglement.

Dąbrowska, Anita, Dariusz Chruściński, Sagnik Chakraborty, and Gniewomir Sarbicki. "Eternally non-Markovian dynamics of a qubit interacting with a single-photon wavepacket." New Journal of Physics 23, no. 12 (December 1, 2021): 123019. http://dx.doi.org/10.1088/1367-2630/ac3c60.

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Abstract An evolution of a two-level system (qubit) interacting with a single-photon wave packet is analyzed. It is shown that a hierarchy of master equations gives rise to phase covariant qubit evolution. The temporal correlations in the input field induce nontrivial memory effects for the evolution of a qubit. It is shown that in the resonant case whenever time-local generator is regular (does not display singularities) the qubit evolution never displays information backflow. However, in general the generator might be highly singular leading to intricate non-Markovian effects. A detailed analysis of the exponential profile is provided which allows to illustrate all characteristic feature of the qubit evolution.

Klimov, V. V., V. S. Letokhov, and M. Ducloy. "Quantum theory of radiation of an excited atom placed near a microresonator containing a single-photon wavepacket: Photon correlation properties." Laser Physics 17, no. 7 (July 2007): 912–26. http://dx.doi.org/10.1134/s1054660x07070043.

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Dąbrowska, Anita Magdalena. "From a posteriori to a priori solutions for a two-level system interacting with a single-photon wavepacket." Journal of the Optical Society of America B 37, no. 4 (March 31, 2020): 1240. http://dx.doi.org/10.1364/josab.383561.

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Bliokh, Konstantin Yu. "Photon centroids and their subluminal propagation." Journal of Physics A: Mathematical and Theoretical, August 11, 2023. http://dx.doi.org/10.1088/1751-8121/acef7f.

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Abstract We examine properties and propagation of the energy-density and photon-probability centroids of electromagnetic wavepackets in free space. In the second-order paraxial approximation, both of these centroids propagate with the same subluminal velocity because of the transverse conﬁnement of the wavepacket and its diﬀraction. The tiny diﬀerence between the energy and probability centroid velocities appears only in the fourth order. We consider three types of wavepackets: Gaussian, Bessel, and non-diﬀracting Bessel. In all these cases, the subluminal propagation is clearly visible in the intensity distributions and can be measured experimentally in both classical-light and single-photon regimes. For Gaussian wavepackets, the half-wavelength delay is accumulated after propagation over about 12 Rayleigh lengths.

Hassan, Arkan, and Julio Gea-Banacloche. "Input–output wavepacket description of two photons interacting with a V-type three-level atom in an optical cavity." AVS Quantum Science 5, no. 2 (May 15, 2023). http://dx.doi.org/10.1116/5.0147934.

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We study the interaction of a V-type atom in a cavity with incident single- and two-photon wavepackets and derive an exact formula, valid in all parameter regimes, relating the spectrum of the outgoing wavepackets to the incident one. We present detailed results for several special input pulses and consider the potential performance of the system as a CPHASE gate for initial pulses in a product state. We find values of the cavity, atomic, and pulse parameters that yield a conditional phase shift of π, albeit with a relatively small overlap between the incoming and outgoing pulse forms.

Yang, Li-Ping, and Zubin Jacob. "Non-classical photonic spin texture of quantum structured light." Communications Physics 4, no. 1 (September 30, 2021). http://dx.doi.org/10.1038/s42005-021-00726-w.

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AbstractClassical structured light with controlled polarization and orbital angular momentum (OAM) of electromagnetic waves has varied applications in optical trapping, bio-sensing, optical communications and quantum simulations. However, quantum noise and photon statistics of three-dimensional photonic angular momentum are relatively less explored. Here, we develop a quantum framework and put forth the concept of quantum structured light for space-time wavepackets at the single-photon level. Our work deals with three-dimensional angular momentum observables for twisted quantum pulses beyond scalar-field theory as well as the paraxial approximation. We show that the spin density generates modulated helical texture and exhibits distinct photon statistics for Fock-state vs. coherent-state twisted pulses. We introduce the quantum correlator of photon spin density to characterize nonlocal spin noise providing a rigorous parallel with electronic spin noise. Our work can lead to quantum spin-OAM physics in twisted single-photon pulses and opens explorations for phases of light with long-range spin order.

Wong, Liang Jie, Nicholas Rivera, Chitraang Murdia, Thomas Christensen, John D. Joannopoulos, Marin Soljačić, and Ido Kaminer. "Control of quantum electrodynamical processes by shaping electron wavepackets." Nature Communications 12, no. 1 (March 17, 2021). http://dx.doi.org/10.1038/s41467-021-21367-1.

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AbstractFundamental quantum electrodynamical (QED) processes, such as spontaneous emission and electron-photon scattering, encompass phenomena that underlie much of modern science and technology. Conventionally, calculations in QED and other field theories treat incoming particles as single-momentum states, omitting the possibility that coherent superposition states, i.e., shaped wavepackets, can alter fundamental scattering processes. Here, we show that free electron waveshaping can be used to design interferences between two or more pathways in a QED process, enabling precise control over the rate of that process. As an example, we show that free electron waveshaping modifies both spatial and spectral characteristics of bremsstrahlung emission, leading for instance to enhancements in directionality and monochromaticity. The ability to tailor general QED processes opens up additional avenues of control in phenomena ranging from optical excitation (e.g., plasmon and phonon emission) in electron microscopy to free electron lasing in the quantum regime.

Abad-Arredondo, Jaime, and Antonio I. Fernández-Domínguez. "Electron-assisted probing of polaritonic light–matter states." Nanophotonics, February 27, 2024. http://dx.doi.org/10.1515/nanoph-2023-0907.

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Abstract Thanks to their exceptional spatial, spectral and temporal resolution, highly-coherent free-electron beams have emerged as powerful probes for material excitations, enabling their characterization even in the quantum regime. Here, we investigate strong light–matter coupling through monochromatic and modulated electron wavepackets. In particular, we consider an archetypal target, comprising a nanophotonic cavity next to a single two-level emitter. We propose a model Hamiltonian describing the coherent interaction between the passing electron beam and the hybrid photonic–excitonic target, which is constructed using macroscopic quantum electrodynamics and fully parameterized in terms of the electromagnetic dyadic Green’s function. Using this framework, we first describe electron-energy-loss and cathodoluminescence spectroscopies, and photon-induced near-field electron emission microscopy. Finally, we show the power of modulated electrons beams as quantum tools for the manipulation of polaritonic targets presenting a complex energy landscape of excitations.

Larsen, Kirk A., Roger Y. Bello, Robert R. Lucchese, C. William McCurdy, Daniel S. Slaughter, and Thorsten Weber. "Strongly coupled intermediate electronic states in one-color two-photon single valence ionization of O₂." Journal of Chemical Physics, December 22, 2022. http://dx.doi.org/10.1063/5.0128846.

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We present an experimental and theoretical energy- and angle-resolved investigation on the non-dissociative photoionization dynamics of near-resonant one-color two-photon single valence ionization of neutral O2 molecules. Using 9.3 eV femtosecond pulses produced via high harmonic generation and a 3-D momentum imaging spectrometer, we detect the photoelectrons and O2+ cations produced from one-color two-photon ionization in coincidence. The measured and calculated photoelectron angular distributions show agreement, which indicates that a superposition of two intermediate electronic states is dominantly involved and that wavepacket motion on those near-resonantly populated intermediate states does not play a significant role in the measured two-photon ionization dynamics. Here we find greater utility in the diabatic representation compared to the adiabatic representation, where invoking a single valence-character diabat is sufficient to describe the underlying two-photon ionization mechanism.

Ossiander, M., K. Golyari, K. Scharl, L. Lehnert, F. Siegrist, J. P. Bürger, D. Zimin, et al. "The speed limit of optoelectronics." Nature Communications 13, no. 1 (March 25, 2022). http://dx.doi.org/10.1038/s41467-022-29252-1.

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AbstractLight-field driven charge motion links semiconductor technology to electric fields with attosecond temporal control. Motivated by ultimate-speed electron-based signal processing, strong-field excitation has been identified viable for the ultrafast manipulation of a solid’s electronic properties but found to evoke perplexing post-excitation dynamics. Here, we report on single-photon-populating the conduction band of a wide-gap dielectric within approximately one femtosecond. We control the subsequent Bloch wavepacket motion with the electric field of visible light. The resulting current allows sampling optical fields and tracking charge motion driven by optical signals. Our approach utilizes a large fraction of the conduction-band bandwidth to maximize operating speed. We identify population transfer to adjacent bands and the associated group velocity inversion as the mechanism ultimately limiting how fast electric currents can be controlled in solids. Our results imply a fundamental limit for classical signal processing and suggest the feasibility of solid-state optoelectronics up to 1 PHz frequency.

Mondal, Subhadip, and Srihari Keshavamurthy. "Phase space perspective on a model for isomerization in an optical cavity." Journal of Chemical Physics 159, no. 7 (August 18, 2023). http://dx.doi.org/10.1063/5.0160586.

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Explanation for the modification of rates and mechanism of reactions carried out in optical cavities still eludes us. Several studies indicate that the cavity-mediated changes in the nature of vibrational energy flow within a molecule may play a significant role. Here, we study a model polaritonic system, proposed and analyzed earlier by Fischer et al., J. Chem. Phys. 156, 154305 (2022), comprising a one-dimensional isomerization mode coupled to a single photon mode in a lossless cavity. We show that the isomerization probability in the presence of virtual photons, for specific cavity–system coupling strengths and cavity frequencies, can exhibit suppression or enhancement for different choices of the initial reactant vibropolariton wavepacket. We observe a qualitative agreement between the classical and quantum average isomerization probabilities in the virtual photon case. A significant part of the effects due to coupling to the cavity can be rationalized in terms of a “chaos–order–chaos” transition of the classical phase space and the phase space localization nature of the polariton states that dominantly participate in the quantum isomerization dynamics. On the other hand, for initial states with zero photons (i.e., a “dark cavity”), the isomerization probability is suppressed when the cavity frequency is tuned near to the fundamental frequency of the reactive mode. The classical–quantum correspondence in the zero photon case is unsatisfactory. In this simple model, we find that the suppression or enhancement of isomerization arises due to the interplay between cavity–system energy flow dynamics and quantum tunneling.

Barends, Thomas R. M., Alexander Gorel, Swarnendu Bhattacharyya, Giorgio Schirò, Camila Bacellar, Claudio Cirelli, Jacques-Philippe Colletier, et al. "Influence of pump laser fluence on ultrafast myoglobin structural dynamics." Nature, February 14, 2024. http://dx.doi.org/10.1038/s41586-024-07032-9.

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AbstractHigh-intensity femtosecond pulses from an X-ray free-electron laser enable pump–probe experiments for the investigation of electronic and nuclear changes during light-induced reactions. On timescales ranging from femtoseconds to milliseconds and for a variety of biological systems, time-resolved serial femtosecond crystallography (TR-SFX) has provided detailed structural data for light-induced isomerization, breakage or formation of chemical bonds and electron transfer1,2. However, all ultrafast TR-SFX studies to date have employed such high pump laser energies that nominally several photons were absorbed per chromophore3–17. As multiphoton absorption may force the protein response into non-physiological pathways, it is of great concern18,19 whether this experimental approach20 allows valid conclusions to be drawn vis-à-vis biologically relevant single-photon-induced reactions18,19. Here we describe ultrafast pump–probe SFX experiments on the photodissociation of carboxymyoglobin, showing that different pump laser fluences yield markedly different results. In particular, the dynamics of structural changes and observed indicators of the mechanistically important coherent oscillations of the Fe–CO bond distance (predicted by recent quantum wavepacket dynamics21) are seen to depend strongly on pump laser energy, in line with quantum chemical analysis. Our results confirm both the feasibility and necessity of performing ultrafast TR-SFX pump–probe experiments in the linear photoexcitation regime. We consider this to be a starting point for reassessing both the design and the interpretation of ultrafast TR-SFX pump–probe experiments20 such that mechanistically relevant insight emerges.