Stephen Vintskevich
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View article: Hanbury Brown-Twiss interference with massively parallel spectral multiplexing for broadband light
Hanbury Brown-Twiss interference with massively parallel spectral multiplexing for broadband light Open
Two-photon interference in the spectral domain is a powerful resource for quantum technologies, enabling both precision measurements and scalable entanglement distribution. Here, we report the first demonstration of massively parallel, wav…
View article: Multifrequency-resolved Hanbury Brown–Twiss effect
Multifrequency-resolved Hanbury Brown–Twiss effect Open
The Hanbury Brown–Twiss (HBT) effect holds a pivotal place in intensity interferometry and gave a seminal contribution to the development of quantum optics. To observe such an effect, both good spectral and timing resolutions are necessary…
View article: Fast data-driven spectrometer with direct measurement of time and frequency for multiple single photons
Fast data-driven spectrometer with direct measurement of time and frequency for multiple single photons Open
We present a single-photon-sensitive spectrometer based on a linear array of 512 single-photon avalanche diode detectors with 0.04 nm spectral and 40 ps temporal resolutions. We employ a fast data-driven operation that allows direct measur…
View article: Multifrequency-resolved Hanbury Brown-Twiss Effect
Multifrequency-resolved Hanbury Brown-Twiss Effect Open
The Hanbury Brown-Twiss (HBT) effect holds a pivotal place in intensity interferometry and gave a seminal contribution to the development of quantum optics. To observe such an effect, both good spectral and timing resolutions are necessary…
View article: Towards quantum telescopes: demonstration of a two-photon interferometer for precision astrometry
Towards quantum telescopes: demonstration of a two-photon interferometer for precision astrometry Open
Classical optical interferometry requires maintaining live, phase-stable links between telescope stations. This requirement greatly adds to the cost of extending to long baseline separations and limits on baselines will in turn limit the a…
View article: Fast data-driven spectrometer with direct measurement of time and frequency for multiple single photons
Fast data-driven spectrometer with direct measurement of time and frequency for multiple single photons Open
We present a single-photon-sensitive spectrometer, based on a linear array of 512 single-photon avalanche diode detectors, with 0.04 nm spectral and 40 ps temporal resolutions. We employ a fast data-driven operation that allows direct meas…
View article: Classification of four-qubit entangled states via machine learning
Classification of four-qubit entangled states via machine learning Open
We apply the support vector machine (SVM) algorithm to derive a set of entanglement witnesses (EW) to identify entanglement patterns in families of four-qubit states. The effectiveness of SVM for practical EW implementations stems from the…
View article: Astrometry in two-photon interferometry using an Earth rotation fringe scan
Astrometry in two-photon interferometry using an Earth rotation fringe scan Open
Optical interferometers may not require a phase-stable optical link between the stations if instead sources of quantum-mechanically entangled pairs could be provided to them, enabling long baselines. We developed a new variation of this id…
View article: Towards Quantum Telescopes: Demonstration of a Two-Photon Interferometer for Quantum-Assisted Astronomy
Towards Quantum Telescopes: Demonstration of a Two-Photon Interferometer for Quantum-Assisted Astronomy Open
Classical optical interferometery requires maintaining live, phase-stable links between telescope stations. This requirement greatly adds to the cost of extending to long baseline separations, and limits on baselines will in turn limit the…
View article: Two-photon amplitude interferometry for precision astrometry
Two-photon amplitude interferometry for precision astrometry Open
Improved quantum sensing of photons from astronomical objects could provide\nhigh resolution observations in the optical benefiting numerous fields,\nincluding general relativity, dark matter studies, and cosmology. It has been\nrecently p…
View article: Increasing baselines and precision of optical interferometers using two-photon interference effects
Increasing baselines and precision of optical interferometers using two-photon interference effects Open
Observations using interferometers provide sensitivity to features of images on angular scales much smaller than any single telescope, on the order of Δθ ~ λ/b where b is the interferometric baseline. Present-day optical interferometers ar…
View article: Classification of four-qubit entangled states via Machine Learning
Classification of four-qubit entangled states via Machine Learning Open
We apply the support vector machine (SVM) algorithm to derive a set of entanglement witnesses (EW) to identify entanglement patterns in families of four-qubit states. The effectiveness of SVM for practical EW implementations stems from the…
View article: Computing with two quantum reservoirs connected via optimized two-qubit non-selective measurements
Computing with two quantum reservoirs connected via optimized two-qubit non-selective measurements Open
Currently, quantum reservoir computing is one of the most promising and experimentally accessible techniques for hybrid, quantum-classical machine learning. However, its applications are limited due to practical restrictions on the size of…
View article: Astrometry in two-photon interferometry using Earth rotation fringe scan
Astrometry in two-photon interferometry using Earth rotation fringe scan Open
Optical interferometers may not require a phase-stable optical link between the stations if instead sources of quantum-mechanically entangled pairs could be provided to them, enabling long baselines. We developed a new variation of this id…
View article: Computing with two quantum reservoirs connected via optimized two-qubit nonselective measurements
Computing with two quantum reservoirs connected via optimized two-qubit nonselective measurements Open
Currently, quantum reservoir computing is one of the most promising and experimentally accessible techniques for hybrid, quantum-classical machine learning. However, its applications are limited due to practical restrictions on the size of…
View article: Fast imaging of single photons in quantum assisted optical interferometers
Fast imaging of single photons in quantum assisted optical interferometers Open
We describe a new technique of quantum astrometry, which potentially can improve the resolution of optical interferometers by orders of magnitude. The approach requires fast imaging of single photons with sub-nanosecond resolution, greatly…
View article: Quantum-assisted optical interferometers: instrument requirements
Quantum-assisted optical interferometers: instrument requirements Open
It has been recently suggested that optical interferometers may not require a\nphase-stable optical link between the stations if instead sources of\nquantum-mechanically entangled pairs could be provided to them, enabling\nextra-long basel…
View article: Two-photon amplitude interferometry for precision astrometry
Two-photon amplitude interferometry for precision astrometry Open
Improved quantum sensing of photons from astronomical objects could provide high resolution observations in the optical benefiting numerous fields, including general relativity, dark matter studies, and cosmology. It has been recently prop…
View article: Mean propagation velocity of multiphoton wave-packet states with nonzero Lorentz-invariant mass
Mean propagation velocity of multiphoton wave-packet states with nonzero Lorentz-invariant mass Open
The concept of Lorenz invariant mass and mean propagation velocity have been investigated in detail for various multiphoton wave-packet states of light. Based on photodetection theory and straightforward kinematics, we presented a physical…
View article: Machine Learning Non-Markovian Quantum Dynamics
Machine Learning Non-Markovian Quantum Dynamics Open
Machine learning methods have proved to be useful for the recognition of patterns in statistical data. The measurement outcomes are intrinsically random in quantum physics, however, they do have a pattern when the measurements are performe…
View article: Effect of an incoherent pump on two-mode entanglement in optical parametric generation
Effect of an incoherent pump on two-mode entanglement in optical parametric generation Open
Pumping a nonlinear crystal by an intense radiation results in the optical parametric generation of photons in two modes (the signal and the idler). The quantized electromagnetic field in these modes is described by a continuous-variable q…
View article: Structured light pulses and their Lorentz-invariant mass
Structured light pulses and their Lorentz-invariant mass Open
Lorentz-invariant mass and mean propagation velocity have been found for structured light pulses in vacuum considered as relativistic objects. We solved the boundary problem for such widely known field configurations as Gauss, Laguerre-Gau…
View article: Lorentz-invariant mass and entanglement of biphoton states
Lorentz-invariant mass and entanglement of biphoton states Open
The concept of the Lorentz-invariant mass of a group of particles is shown to\nbe applicable to biphoton states formed in the process of spontaneous\nparametric down conversion. The conditions are found when the Lorentz-invariant\nmass is …
View article: Simulation Complexity of Open Quantum Dynamics: Connection with Tensor Networks
Simulation Complexity of Open Quantum Dynamics: Connection with Tensor Networks Open
The difficulty to simulate the dynamics of open quantum systems resides in their coupling to many-body reservoirs with exponentially large Hilbert space. Applying a tensor network approach in the time domain, we demonstrate that effective …
View article: Machine learning of Markovian embedding for non-Markovian quantum dynamics
Machine learning of Markovian embedding for non-Markovian quantum dynamics Open
Machine learning methods have proved to be useful for the recognition of patterns in statistical data. The measurement outcomes are intrinsically random in quantum physics, however, they do have a pattern when the measurements are performe…
View article: Entanglement of multiphoton polarization Fock states and their superpositions
Entanglement of multiphoton polarization Fock states and their superpositions Open
Density matrices of pure multiphoton Fock polarization states and of arising from them reduced density matrices of mixed states are expressed in similar ways in terms of matrices of correlators defined as averaged products of equal numbers…
View article: Temporal interference effects in noncollinear and frequency-nondegenerate spontaneous parametric down-conversion
Temporal interference effects in noncollinear and frequency-nondegenerate spontaneous parametric down-conversion Open
We consider regimes of Spontaneous Parametric Down-Conversion both\nnoncollinear and nondegenerate in frequencies. Parameters characterizing\ndegrees of noncollinearity and of nondgeneracy are defined, and they are shown\nto be not indepen…
View article: Dimension truncation for open quantum systems in terms of tensor networks
Dimension truncation for open quantum systems in terms of tensor networks Open
We present novel and simple estimation of a minimal dimension required for an effective reservoir in open quantum systems. Using a tensor network formalism we introduce a new object called a reservoir network (RN). The reservoir network is…
View article: Invariant Mass and Propagation Speed of Light Pulses in Vacuum
Invariant Mass and Propagation Speed of Light Pulses in Vacuum Open
The concept of the Lorentz-invariant mass of groups of photons is shown to be applicable to classical light pulses with finite sizes and duration. Diffraction of light, providing non-collinearity of the photon motion in pulses, provides al…
View article: Multimode coherent states and the Lorentz-invariant mass of light pulses
Multimode coherent states and the Lorentz-invariant mass of light pulses Open
The total mass of noncollinear photons forming diverging light pulses is defined and found explicitly. Both classical and quantum derivations are presented. The quantum derivation is based on the use of multimode coherent states, and links…