A5029213246- Quantum Information and Cryptography
- Photonic and Optical Devices
- Neural Networks and Reservoir Computing
- Quantum Mechanics and Applications
- Quantum Computing Algorithms and Architecture
- Quantum optics and atomic interactions
- Advanced Optical Sensing Technologies
- Orbital Angular Momentum in Optics
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- Mechanical and Optical Resonators
- Optical Network Technologies
- Advanced Fluorescence Microscopy Techniques
- Atomic and Subatomic Physics Research
- Spectroscopy and Laser Applications
- Optical Polarization and Ellipsometry
- Cold Atom Physics and Bose-Einstein Condensates
- Photoacoustic and Ultrasonic Imaging
- Random lasers and scattering media
- Advanced X-ray Imaging Techniques
- Diamond and Carbon-based Materials Research
- Advanced Chemical Physics Studies
- Laser-Matter Interactions and Applications
- Advanced X-ray and CT Imaging
- Photorefractive and Nonlinear Optics
Brookhaven National Laboratory
2022-2025
University of Ottawa
2020-2024
The University of Queensland
2017-2024
Stony Brook University
2023
American University of Ras Al Khaimah
2023
ARC Centre of Excellence for Engineered Quantum Systems
2017-2020
Universidade Estadual de Campinas (UNICAMP)
2014
Knowing the properties of single photons produced in a Spontaneous Parametric Down-Conversion (SPDC) source can be crucial for specific applications and uses. In particular, spectral are key relevance. Here, we investigate commercial SPDC using our fast broadband spectrometer. Our analysis is valid method other sources, as well single-photon generation techniques, thus providing good example how to use this spectrometer design. We calibrate known lines argon emission spectrum. show that two...
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...
Abstract A scheme for active temporal‐to‐spatial demultiplexing of single photons generated by a solid‐state source is introduced. The scales quasi‐polynomially with photon number, providing viable technological path routing n in the one temporal stream from emitter to different spatial modes. Active demonstrated using state‐of‐the‐art source—a quantum‐dot deterministically coupled micropillar cavity—and custom‐built demultiplexer—a network electro‐optically reconfigurable waveguides...
We implement a general imaging method by measuring the complex degree of coherence using linear optics and photon number resolving detectors. In absence collective or entanglement-assisted measurements, our is optimal over large range practically relevant values coherence. measure size position small distant source pseudothermal light, show that outperforms traditional an order magnitude in precision. Finally, we lack photon-number resolution detectors has only modest detrimental effect on...
We examine the precision limits of Hong-Ou-Mandel (HOM) timing measurements, as well applying to generalized two-photon measurements. As a special case, we consider use measurements using photons with variable bandwidths and frequency correlations. When photon are not equal, maximizing measurement involves trade-off between high interference visibility strong anticorrelations, optimal occuring when share non-maximal anticorrelations. show that has qualitatively similar those HOM whenever is...
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...
Light, being massless, casts no shadow; under ordinary circumstances, photons pass right through each other unimpeded. Here, we demonstrate a laser beam acting like an object - the shadow upon surface when is illuminated by another light source. We observe regular in sense it can be seen naked eye, follows contours of falls on, and position shape (the beam). Specifically, use nonlinear optical process involving four atomic levels ruby. find maximum contrast approximately 22 percent, similar...
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...
Light, being massless, casts no shadow; under ordinary circumstances, photons pass right through each other unimpeded. Here, we demonstrate a laser beam acting like an object — the shadow upon surface when is illuminated by another light source. We observe regular in sense it can be seen naked eye, follows contours of falls on, and position shape (the beam). Specifically, use nonlinear optical process involving four atomic levels ruby. are able to control intensity transmitted applying...
A capillary discharge tube was used to record the Xe spectrum in 400–5500 Å region. set of 243 lines vi observed, and 146 them were classified for first time. For all known lines, we calculated weighted oscillator strengths (gf) transition probabilities (gA) using configuration interaction a relativistic Hartree–Fock approach. The energy matrix parameters adjusted fit experimental levels. Core polarization effects taken into account our calculations. Experimental values lifetimes are also...
Incompatible observables underlie pillars of quantum physics such as contextuality and entanglement. The Heisenberg uncertainty principle is a fundamental limitation on the measurement product incompatible observables, `joint' measurement. However, recently method using weak has experimentally demonstrated joint This [Lundeen, J. S., Bamber, C. Phys. Rev. Lett. 108, 070402, 2012] delivers standard expectation value even if they are incompatible. A drawback this that it requires coupling each...
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...
Single photons from a solid state source are deterministically routed into different output modes by fully integrated active optical switch network. Using state-of-the-art single photon made of quantum dot in micropillar cavity and an innovative demultiplexer, this scheme is capable creating manifold states. Such states crucial resource for photonic information applications including linear optics computation communications. (Picture: Mirko Lobino, Ph.D. et al., article number 1600297, issue)
The SPDC of X-rays via nonlinear Bragg diffraction from a diamond crystal is explored at synchrotron light source. In this report we share, to the best our knowledge, record detection along with imaging applications.
Quantum imaging encompasses a broad range of methods that exploit the quantum properties light to capture information about an object. One such approach involves using two-photon state, where only one photon interacts with object being imaged while its entangled partner carries spatial or temporal information. To implement this technique, it is necessary generate specific states and detect photons at single-photon level. While method has been successfully demonstrated in visible...
Spatial transformations of light are ubiquitous in optics, with examples ranging from simple imaging a lens to quantum and classical information processing waveguide meshes. Multi-plane converter (MPLC) systems have emerged as platform that promises completely general spatial transformations, i.e., universal unitary. However until now, MPLC demonstrated far general, e.g., converting Gaussian Laguerre-Gauss mode. Here, we demonstrate the promise an MLPC, ability impose arbitrary unitary...
We propose a new approach to quantum-assisted astrometry with the potential improve their astrometric precision by orders of magnitude. extend our framework super-resolution microscopy and sensor networks demonstrate novel experimental capabilities.
Spatial transformations of light are ubiquitous in optics, with examples ranging from simple imaging a lens to quantum and classical information processing waveguide meshes. Multi-plane converter (MPLC) systems have emerged as platform that promises completely general spatial transformations, i.e., universal unitary. However, until now, MPLC demonstrated far general, e.g., converting Gaussian Laguerre-Gauss mode. Here, we demonstrate the promise an MLPC, ability impose arbitrary unitary...
We present a single-photon-sensitive spectrometer, based on linear array of 512 single-photon avalanche diode detectors, with 0.04 nm spectral and 40 ps temporal resolutions. employ fast data-driven operation that allows direct measurement time frequency for simultaneous single photons, time- frequency-stamping each detection. Our results combine excellent resolution. benchmark our result against the Heisenberg Uncertainty Principle limit hbar/2 energy, we are only factor 10 above it,...
Knowing the properties of single photons produced in a Spontaneous Parametric Down-Conversion (SPDC) source can be crucial for specific applications and uses. In particular, spectral are key relevance. Here, we investigate commercial SPDC using our fast broadband spectrometer. Our analysis is valid method other sources, as well single-photon generation techniques, thus providing good example how to use this spectrometer design. We calibrate known lines argon emission spectrum. show that two...
We implement an optimal imaging method using number-resolving photon detectors. Measuring the complex degree of coherence, we obtain size and position a distant pseudothermal light source show this outperforms traditional imaging.