A5052224244- Quantum Information and Cryptography
- Quantum Mechanics and Applications
- Advanced Fiber Laser Technologies
- Orbital Angular Momentum in Optics
- Quantum optics and atomic interactions
- Advanced Optical Sensing Technologies
- Neural Networks and Reservoir Computing
- Advanced Measurement and Metrology Techniques
- Quantum Computing Algorithms and Architecture
- Mechanical and Optical Resonators
- Spectroscopy and Quantum Chemical Studies
- Relativity and Gravitational Theory
- Quantum Electrodynamics and Casimir Effect
- Adaptive optics and wavefront sensing
- Photonic and Optical Devices
- Advanced Fluorescence Microscopy Techniques
- Spectroscopy and Laser Applications
- Advanced Thermodynamics and Statistical Mechanics
- Optical Polarization and Ellipsometry
- Laser-Matter Interactions and Applications
- Quantum many-body systems
- Geophysics and Sensor Technology
- Laser-Plasma Interactions and Diagnostics
- Inertial Sensor and Navigation
- CCD and CMOS Imaging Sensors
Technology Innovation Institute
2023-2025
Stony Brook University
2023
Brookhaven National Laboratory
2023
Moscow Institute of Physics and Technology
2015-2022
Prokhorov General Physics Institute
2015-2019
Machine learning methods have proved to be useful for the recognition of patterns in statistical data. The measurement outcomes are intrinsically random quantum physics, however, they do a pattern when measurements performed successively on an open system. This is due system-environment interaction and contains information about relaxation rates as well non-Markovian memory effects. Here we develop method extract unknown environment from series projective single-shot system (without...
The difficulty to simulate the dynamics of open quantum systems resides in their coupling many-body reservoirs with exponentially large Hilbert space. Applying a tensor network approach time domain, we demonstrate that effective small can be defined and used for modeling dynamics. key element our technique is timeline reservoir (TRN), which contains all information on reservoir's characteristics, particular, memory effects timescale. TRN has one-dimensional structure, effectively...
We apply the support vector machine (SVM) algorithm to derive a set of entanglement witnesses (EW) identify patterns in families four-qubit states. The effectiveness SVM for practical EW implementations stems from coarse-grained description equivalent entangled quantum equivalence criteria our work is based on stochastic local operations and classical communication classification Werner numerically verify that approach provides an effective tool address witness problem when given family...
The Hanbury Brown–Twiss (HBT) effect holds a pivotal place in intensity interferometry and gave seminal contribution to the development of quantum optics. To observe such an effect, both good spectral timing resolutions are necessary. Most often, HBT is observed for single frequency at time due its limitations dealing with multifrequencies simultaneously, halting limiting some applications. Here, we report fast data-driven spectrometer built one-dimensional array single-photon-sensitive...
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 proposed that stations interferometers would not require a phase-stable link if instead sources quantum-mechanically entangled pairs be provided to them, potentially enabling hitherto prohibitively long baselines. A new refinement this idea is developed, which...
The uses of a silicon-pixel camera with very good time resolution (∼nanosecond) for detecting multiple, bunched optical photons is explored. We present characteristics the and describe experiments proving its counting capabilities. use spontaneous parametric down-conversion source to generate correlated photon pairs, exploit Hong-Ou-Mandel (HOM) interference effect in fiber-coupled beam splitter bunch pair onto same output fiber. It shown that spatial enables independent detection two...
Classical optical interferometry requires maintaining live, phase-stable links between telescope stations. This requirement greatly adds to the cost of extending long baseline separations and limits on baselines will in turn limit achievable angular resolution. Here we describe a novel type two-photon interferometer for astrometry, which uses photons from two separate sky sources does not require an link Such techniques may make large increases interferometric practical, even by orders...
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 new variation this idea, proposing that photons from two different astronomical interfered at decoupled stations. Interference products can then calculated in post-processing or requiring only slow, classical connection In work, we investigated practical feasibility approach....
It has been recently suggested that optical interferometers may not require a phase-stable link between the stations if instead sources of quantum-mechanically entangled pairs could be provided to them, enabling extra- long baselines and benefiting numerous topics in astrophysics cosmology. We developed new variation this idea, proposing two photons from different interfered at decoupled stations, requiring only slow classical information them. show approach allow high- precision...
The Hanbury Brown-Twiss (HBT) effect holds a pivotal place in intensity interferometry and gave seminal contribution to the development of quantum optics. To observe such an effect, both good spectral timing resolutions are necessary. Most often, HBT is observed for single frequency at time, due limitations dealing with multifrequencies simultaneously, halting limiting some applications. Here, we report fast data-driven spectrometer built one-dimensional array single-photon-sensitive...
We show that the concept of Lorentz-invariant mass groups particles can be applied to light pulses consisting very large but finite numbers noncollinear photons. Explicit expressions are found for invariant this manifold photons case diverging Gaussian propagating in vacuum. As is finite, propagate vacuum with a speed somewhat smaller than speed. A small difference between and beam-propagation velocity directly related pulse. Focusing and/or defocusing shown strengthen effect which pulse...
Pumping a nonlinear crystal by an intense radiation results in the optical parametric generation of photons two modes (the signal and idler). The quantized electromagnetic field these is described continuous-variable quantum state, which entangled if pump coherent state produced laser. idler remain populated even becomes incoherent (dephased medium, superposed with thermal or alternative source such as superluminescent diode). However, does effect entanglement purity modes, vital importance...
The concept of the Lorentz-invariant mass groups photons is shown to be applicable classical light pulses with finite sizes and duration. Diffraction light, providing non-collinearity photon motion in pulses, provides also nonzero values their masses. By considering as relativistic objects we find that owing diffraction finiteness mean propagation speed always smaller than c.
Classical optical interferometery requires maintaining live, phase-stable links between telescope stations. This requirement greatly adds to the cost of extending long baseline separations, and limits on baselines will in turn limit achievable angular resolution. Here we describe a novel type two-photon interferometer for astrometry, which uses photons from two separate sky sources does not require an link Such techniques may make large increases interferometric practical, even by orders...
The mean velocity of a finite-size short light pulse in far zone is defined as the vectorial sum velocities all rays forming pulse. Because diffraction, this way always somewhat smaller than speed light. conditions are found when slowing-down effect sufficiently pronounced to be experimentally measurable. Under these original Gaussian shape strongly modified with significant lengthening rear wing field envelope. Schemes for measuring effects suggested and discussed.
We consider regimes of spontaneous parametric down-conversion, both noncollinear and nondegenerate in frequencies. Parameters characterizing degrees noncollinearity nondegeneracy are defined, they shown to be not independent each other. At a given degree the emitted photons propagate along two different cones, opening angles which determined by nondegeneracy. Based on this, can controlled means angular selection photons, e.g., with help appropriately installed slits. For such selected their...
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 proposed that stations interferometers would not require a phase-stable link if instead sources quantum-mechanically entangled pairs be provided to them, potentially enabling hitherto prohibitively long baselines. A new refinement this idea is developed, which...
We present novel and simple estimation of a minimal dimension required for an effective reservoir in open quantum systems. Using tensor network formalism we introduce new object called (RN). The is the form Matrix Product State, which contains all effects dynamics. This especially useful understanding memory effects. discuss possible applications to develop numerical machine learning based methods
The concept of the Lorentz-invariant mass a group particles is shown to be applicable biphoton states formed in process spontaneous parametric down conversion.The conditions are found when related directly with (proportional to) Schmidt parameter K ≫ 1 determining high degree entanglement state respect transverse wave vectors emitted photons.
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 such widely known field configurations Gauss, Laguerre-Gauss, Bessel-Gauss, Hermite-Gauss, Airy-Gauss ones.The were taken having finite duration temporal envelope.We discovered that Lorentzinvariant significantly depend on spatial-temporal structure of pulses.We is independent full energy pulse smaller than speed light.
Density matrices of pure multiphoton Fock polarization states and their resultant reduced density mixed are expressed in similar ways terms correlators, defined as averaged products equal numbers creation annihilation operators. The degree entanglement considered is evaluated for various combinations parameters characters reduction.
The well-known Hong–Ou–Mandel effect is revisited. Two physical reasons are discussed for the to be less pronounced or even disappear: differing polarizations of photons coming beamsplitter and delay time in one two channels. For latter we use concepts biphoton frequency temporal wave functions depending, correspondingly, on continuous variables t1 t2 interpreted as arrival times beamsplitter. Explicit expressions found probability densities total probabilities photon pairs split between...