A5012640595- Quantum Information and Cryptography
- Quantum Mechanics and Applications
- Advanced Optical Sensing Technologies
- Advanced Fluorescence Microscopy Techniques
- Orbital Angular Momentum in Optics
- Quantum optics and atomic interactions
- Laser-Matter Interactions and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Random lasers and scattering media
- Advanced Fiber Laser Technologies
- Cancer survivorship and care
- Semiconductor Lasers and Optical Devices
- Semiconductor Quantum Structures and Devices
- Quantum Computing Algorithms and Architecture
- Optical Imaging and Spectroscopy Techniques
- CCD and CMOS Imaging Sensors
- Mechanical and Optical Resonators
- Photonic and Optical Devices
- Medical Imaging Techniques and Applications
- Childhood Cancer Survivors' Quality of Life
- Cancer-related cognitive impairment studies
- Optical Network Technologies
- Advanced X-ray and CT Imaging
- Fault Detection and Control Systems
- Neural Networks and Reservoir Computing
University of Wisconsin–Madison
2023-2025
STMicroelectronics (United Kingdom)
2020-2023
CEA LETI
2021
CEA Grenoble
2021
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2021
Heriot-Watt University
2014-2019
Scottish Universities Physics Alliance
2016
University of Waterloo
2013-2015
University of Ottawa
2011-2013
University of Indianapolis
2003
The light produced by parametric down-conversion shows strong spatial entanglement that leads to violations of EPR criteria for separability. Historically, such studies have been performed scanning a single-element, single-photon detector across detection plane. Here we show modern electron-multiplying charge-coupled device cameras can measure correlations in both position and momentum multi-pixel field view. This capability allows us observe around 2,500 states demonstrate...
Systems entangled in high dimensions have recently been proposed as important tools for various quantum information protocols, such multibit key distribution and loophole-free tests of nonlocality. It is therefore to precise knowledge the nature states. We tomographically reconstruct state two photons produced by parametric downconversion that are a $d$-dimensional orbital angular momentum basis. determine exactly density matrix two-qu$d$it with $d$ ranging from 2 8. The recording...
A simple approach to preparing high-dimensional entangled states by quantum interference.
Orbital angular momentum (OAM) entanglement is investigated in the Bessel-Gauss (BG) basis. Having a readily adjustable radial scale, BG modes provide more favourable basis for OAM over Laguerre-Gaussian (LG) modes. The bandwidth terms of can be increased by selection particular and leads to flattening spectrum. spectrum allows higher entanglement. We demonstrate performing Bell-type experiment violating appropriate Clauser Horne Shimony Holt (CHSH) inequality. In addition, we reconstruct...
Entanglement swapping generates remote quantum correlations between particles that have not interacted and is the cornerstone of long-distance communication, networks, fundamental tests science. In context spatial modes light, high-dimensional entanglement provides an avenue to increase bandwidth communications more stringent limits for foundations. Here we simultaneously swap multiple orbital angular momentum states light. The system based on a degenerate filter cannot distinguish different...
Time-bin encoding is a robust form of optical quantum information, especially for transmission in fibers. To read out the separation time bins must be larger than detector resolution, typically on order nanoseconds photon counters. In present work, we demonstrate technique using nonlinear interaction between chirped entangled time-bin photons and shaped laser pulses to perform projective measurements arbitrary states with picosecond-scale separations. We tomographically-complete set qubit...
Abstract Traditional ghost imaging requires correlated but spatially separated photons and has been observed in many physical situations, spanning both the quantum classical regimes. Here we observe a new system—a system based on entanglement swapping, key feature of network. We detail how exact form interference between independent dictates precise nature imaging, for example, an anti-symmetric projection, recorded image is contrast-reversed version object—where object bright, dark, vice...
Purpose Physical activity may greatly benefit adults living with advanced cancer; however, barriers to physical and preferences for supportive care interventions are not well understood. This study investigates differences in intervention by demographic clinical characteristics among cancer. Methods Data came from a cross-sectional of 247 cancer who visited the University Wisconsin Carbone Cancer Centre January 2021 2023. The Godin–Shepard Leisure Score Index (insufficiently active,...
Abstract Accurately establishing the state of large-scale quantum systems is an important tool in information science; however, large number unknown parameters hinders rapid characterisation such states and reconstruction procedures can become prohibitively time-consuming. Compressive sensing, a procedure for solving inverse problems by incorporating prior knowledge about form solution, provides attractive alternative to problem high-dimensional characterisation. Using modified version...
The controlled generation of entangled states and their subsequent detection are integral aspects quantum information science. In this Letter, we implement a simple precise technique that produces any the four Bell in orbital angular momentum degree freedom. We then use these to perform first experimental demonstration an accessible nonlinear entanglement witness. Such witness determines by using same measurements as required for linear but can detect, case, twice many single can. anticipate...
The ability to uniquely identify a quantum state is integral science, but for nonorthogonal states, mechanics precludes deterministic, error-free discrimination. However, using the nondeterministic protocol of unambiguous discrimination enables differentiation at cost lower frequency success. We discriminate experimentally between nonorthogonal, high-dimensional states encoded in single photons; our results range from dimension d=2 d=14. quantify performance method by comparing total...
Abstract We report an algorithm for reconstructing images when the average number of photons recorded per pixel is order unity, i.e. photon-sparse data. The image optimisation minimises a cost function incorporating both Poissonian log-likelihood term based on deviation reconstructed from measured data and regularization-term upon sum moduli second spatial derivatives intensities. balance between these two terms set by bootstrapping technique where target value deduced smoothed version...
The design and performance characteristics of a 1.2 Gbit/s transimpedance receiver OEIC incorporating high voltage gain, low input capacitance cascode amplifier 50Ω driver is reported. exhibited an improvement factor two in bandwidth over those using conventional single inverter gain stage. An optical sensitivity −27.5 dBm for error rate 10−9 at 1.3 μm wavelength has been obtained without equalisation or noise filtering.
Abstract We present an efficient simulation method for electronic transport and avalanche in single-photon diodes (SPAD). Carrier is simulated the real space using a particle Monte Carlo approach based on Fokker–Planck point of view advection-diffusion equation, that enables us to reproduce mobility models, including electric fields doping dependencies. The process computed thanks impact ionization rates implemented modified Random Path Length algorithm. Both mechanisms are concurrently from...
Single Photon Avalanche Diodes (SPAD) are key optoelectronic detectors for medical imaging, camera ranging and automotive laser imaging detection (LiDAR) applications. Today, most of SPADs in the Time Of Flight (TOF) market composed a micrometric Silicon PN junction associated to proximity CMOS electronics biasing system above breakdown voltage. These devices present low noise, high pixel-matrix integration capabilities, but their Detection Efficiency (PDE) is relatively modest near infrared...
A new method to reliably simulate the PDE and jitter tail for realistic three-dimensional SPAD devices is presented. The simulation based on use of electric field lines mimic carriers' trajectories, one-dimensional models avalanche breakdown probability charges transport. This approach allows treating a problem as several problems along each line. original applied McIntyre model calculate PDE, but also prediction using dedicated advection-diffusion model. results obtained numerically are...
We present a Verilog-A model accounting for the temporal avalanche buildup and its statistics in Single-Photon Avalanche Diodes (SPADs). This physics-based approach is compared to TCAD mixed-mode analyzing predictions, as well measurements. The that can be order of hundreds picoseconds, affects statistical pulse width distribution, which experimentally verified. Furthermore, we address detail voltage swing across device during quenching, studying impact on power consumption. help chip...
Dark Count Rate (DCR) in Single-Photon Avalanche Diodes (SPAD) Complementary Metal-Oxide Semiconductor technology is characterized and analyzed with a comprehensive simulation methodology. Based on series of measurements SPAD various architectures, an extended range voltages temperatures, the DCR are correlated to spatial localization traps within device their parameters. To this aim, process electrical simulations using Technology Computer-Aided Design (TCAD) tools combined in-house...