A5048478734- Quantum Information and Cryptography
- Advanced Optical Sensing Technologies
- Quantum Mechanics and Applications
- Quantum Computing Algorithms and Architecture
- Advanced Fiber Laser Technologies
- Quantum optics and atomic interactions
- Advanced Fluorescence Microscopy Techniques
- Ocular and Laser Science Research
- Photonic and Optical Devices
- Photorefractive and Nonlinear Optics
- Quantum-Dot Cellular Automata
- CCD and CMOS Imaging Sensors
- Solid State Laser Technologies
- Chaos-based Image/Signal Encryption
- Advanced Photonic Communication Systems
- Optical Network Technologies
- Laser-Matter Interactions and Applications
- Optical Imaging and Spectroscopy Techniques
- Semiconductor Lasers and Optical Devices
- Chaos control and synchronization
- Spectroscopy and Laser Applications
- Nonlinear Dynamics and Pattern Formation
- Analytical Chemistry and Sensors
- Laser Design and Applications
- Mechanical and Optical Resonators
National Institute of Standards and Technology
2015-2024
Joint Quantum Institute
2013-2024
University of Maryland, College Park
2012-2023
Material Measurement Laboratory
2012-2013
National Institute of Standards
2004-2013
U.S. Air Force Research Laboratory Directed Energy Directorate
2003
Kirtland Air Force Base
2001-2003
United States Air Force Research Laboratory
2003
University of New Mexico
1997-2002
Duke University
1996-1998
We present a loophole-free violation of local realism using entangled photon pairs. ensure that all relevant events in our Bell test are spacelike separated by placing the parties far enough apart and fast random number generators high-speed polarization measurements. A high-quality polarization-entangled source photons, combined with high-efficiency, low-noise, single-photon detectors, allows us to make measurements without requiring any fair-sampling assumptions. Using hypothesis test, we...
Conventional quantum key distribution (QKD) typically uses binary encoding based on photon polarization or time-bin degrees of freedom and achieves a capacity at most one bit per photon. Under photon-starved conditions the rate detection events is much lower than generation rate, because losses in long distance propagation relatively recovery times available single-photon detectors. Multi-bit arrival can be beneficial such situations. Recent security proofs indicate high-dimensional robust...
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text L. K. Shalm, E. Meyer-Scott, B. G. Christensen, P. Bierhorst, M. A. Wayne, J. Stevens, T. Gerrits, S. Glancy, D. R. Hamel, Allman, Coakley, Dyer, C. Hodge, Lita, V. Verma, Lambrocco, Tortorici, Migdall, Y. Zhang, Kumor, W. H. Farr, F. Marsili, Shaw, Stern, Abellán, Amaya, Pruneri, Jennewein, Mitchell, Kwiat, Bienfang, Mirin, Knill, and Nam, "A strong loophole-free test...
We observe incomplete synchronization of coupled chaotic oscillators over a wide range coupling strengths and schemes for which high-quality is expected. Long intervals are interrupted at irregular times by large, brief desynchronization events that can be attributed to "attractor bubbling," clearly demonstrating the standard criterion not always useful in experiments. suggest simple method rapidly selecting most likely produce synchronization.
Certain dynamical systems exhibit a phenomenon called bubbling, whereby small perturbations induce intermittent bursting. In this Letter we show that, as parameter is varied through critical value, the transition to bubbling can be ``hard'' (the bursts appear abruptly with large amplitude) or ``soft'' maximum burst amplitude increases continuously from zero), and that presence absence of symmetry in unperturbed system has fundamental effect on these transitions. These results are confirmed...
We describe a gated Geiger-mode single-photon avalanche diode (SPAD) detection system in which both gating and discrimination are implemented by coherent addition of discrete harmonics the fundamental gate frequency. With amplitude phase control for each harmonic at cathode, we form <340 ps bias gates, with similar anode cancel transient >65 dB suppression, allowing avalanche-discrimination thresholds below 2 mV or <8 fC. The low threshold not only accurately...
Applications of randomness such as private key generation and public beacons require small blocks certified random bits on demand. Device-independent quantum number generators can produce bits, but existing quantum-proof protocols loophole-free implementations suffer from high latency, requiring many hours to any bits. We demonstrate device-independent a Bell test with more efficient protocol, obtaining multiple $512$ an average experiment time less than $5$ min per block error bounded by...
Superconducting nanowire single-photon detectors (SNSPDs) are the highest-performance photon-counting technology in near infrared, but traditional designs typically trade off between timing resolution and detection efficiency. The authors utilize transmission-line engineering differential readout to achieve a design with high efficiency low jitter simultaneously. This also enables imaging capabilities photon-number resolution, is compatible commercial time taggers. device versatile solution...
We have demonstrated the exchange of sifted quantum cryptographic key over a 730 meter free-space link at rates up to 1.0 Mbps, two orders magnitude faster than previously reported results. A classical channel 1550 nm operates in parallel with 845 nm. Clock recovery techniques on 1.25 Gbps enable transmission clock rate. System performance is currently limited by timing resolution our silicon avalanche photodiode detectors. With improved detector resolution, technique will yield another...
A 20-W all-solid-state continuous-wave single-frequency source tuned to the sodium D2a line at 589.159 nm has been developed for adaptive optical systems. This is based on sum-frequency mixing two injection-locked Nd:YAG lasers in lithium triborate a doubly resonant external cavity. Injection locking not only ensures operation but also allows use of single rf local oscillator Pound-Drever-Hall both injection-slave and cavities. We observe power-conversion efficiencies excess 55% linearly...
We present a loophole-free violation of local realism using entangled photon pairs. ensure that all relevant events in our Bell test are spacelike separated by placing the parties far enough apart and fast random number generators high-speed polarization measurements. A high-quality polarization-entangled source photons, combined with high-efficiency, low-noise, single-photon detectors, allows us to make measurements without requiring any fair-sampling assumptions. Using hypothesis test, we...
We measure the detection efficiency of single-photon detectors at wavelengths near 851 nm and 1533.6 nm. investigate spatial uniformity one free-space-coupled avalanche diode present a comparison between fusion-spliced connectorized fiber-coupled detectors. find that our expanded relative uncertainty for single measurement is as low 0.70 % measurements high 1.78 free-space characterization 851.7 The detection-efficiency determination includes corrections afterpulsing, dark count, count-rate...
Scaling up cryogenic systems, like arrays of superconducting nanowire single-photon detectors (SNSPDs), requires developing coprocessors to minimize the number cables exiting cryostat. This work addresses this challenge by demonstrating ability read out, process, encode, and store data from SNSPDs using integrated electronics. The authors design a digital counter based on nanocryotrons---three-terminal devices---to perform signal processing digitization at low temperatures. These results...
We demonstrate generation of high-purity photon pairs at 1560 nm in a single spatial mode from periodically-poled KTiOPO 4 (PPKTP) waveguide.With nearly lossless spectral filtering, the PPKTP waveguide source shows approximately 80 % single-mode fiber coupling efficiency and is well suited for high-dimensional time-energy entanglement-based quantum key distribution.Using high-count-rate self-differencing InGaAs single-photon avalanche photodiodes configured with either square or sinusoidal...
We present a quantitative study of various limitations on quantum cryptographic systems operating with sifted-key rates over Mbit/s. The dead time silicon APDs not only limits the rate but also causes correlation between neighboring key bits. In addition to well-known count-rate dependent timing jitter in avalanche photo-diode (APD), faint laser sources, vertical cavity surface emission lasers (VCSELs) our system, induce significant amount data-dependent jitter. Both and are major limiting...
Afterpulsing was investigated experimentally in an InGaAs single-photon avalanche diode (SPAD) operating the biasing and sensing regime of periodic-gating techniques. These techniques support counting at rates 100 MHz range with low afterpulse probability are characterized by sub-nanosecond active gates that limit total avalanche-charge flows to fC or less. We achieved comparable gating performance a system using non-periodic were able make traditional double-pulse measurements from 4.8 ns 2...
The paper proposes algorithmic and environmental modifications to the extant reconciliation algorithms within BB84 protocol so as speed up privacy amplification. These have been known be a performance bottleneck 1 can process data at rates that are six times slower than quantum channel they serve2. As improvements in single-photon sources detectors expected improve throughput by two or three orders of magnitude, it becomes imperative classical software. We developed Cascade-like algorithm...
NIST has developed a high-speed quantum key distribution (QKD) test bed incorporating both free-space and fiber systems. These systems demonstrate major increase in the attainable rate of QKD systems: over two orders magnitude faster than other NIST's approach to is based on synchronous model with hardware support. Practical one-time pad encryption requires high generation rates since one bit needed for each data be encrypted. A encrypted surveillance video application was serves as...
Abstract When photon-counting detectors are calibrated in the presence of a background signal, deadtime effects can be significant and must carefully accounted for to achieve high accuracy. We present method separating correlated signal from that appropriately handles effects. This includes consideration pulse timing afterpulsing issues arise typical avalanche photodiode (APD) detectors. illustrate how these should calibration process. also discuss detector considered calibration....
The maximum achievable data-rate of a quantum communication system can be critically limited by the efficiency and temporal resolution system's single-photon detectors. Frequency up-conversion technology used to increase detection for IR photons. In this paper we describe scheme improve an detector using multi-wavelength optical-sampling techniques, allowing increased transmission rates in communications systems. We experimentally demonstrate our approach with two spectrally temporally...
Recent advances in quantum key distribution (QKD) have given rise to systems that operate at transmission periods significantly shorter than the dead times of their component single-photon detectors. As continue increase rate, security concerns associated with detector can limit production rate sifted bits. We present a model high-speed QKD this identifies an optimum for system link loss and response characteristics.