A5071908538- Photonic and Optical Devices
- Advanced Optical Sensing Technologies
- Quantum Information and Cryptography
- Advanced Fiber Laser Technologies
- Photodynamic Therapy Research Studies
- Neural Networks and Reservoir Computing
- Analytical Chemistry and Sensors
- Advanced Fiber Optic Sensors
- Optical Imaging and Spectroscopy Techniques
- Optical Coherence Tomography Applications
- Advanced Fluorescence Microscopy Techniques
- Lung Cancer Diagnosis and Treatment
- Quantum optics and atomic interactions
- Quantum and electron transport phenomena
- Mechanical and Optical Resonators
- Optical Network Technologies
- Photoacoustic and Ultrasonic Imaging
- Spectroscopy Techniques in Biomedical and Chemical Research
- Esophageal Cancer Research and Treatment
- Photonic Crystal and Fiber Optics
- Quantum Computing Algorithms and Architecture
- Atomic and Subatomic Physics Research
- Urban Transport and Accessibility
- Transportation Planning and Optimization
- Semiconductor Quantum Structures and Devices
Heriot-Watt University
2015-2024
Physical Sciences (United States)
2023
Atomic Weapons Establishment
2023
Scottish Universities Physics Alliance
2013-2022
University of Edinburgh
2016-2022
Centre for Inflammation Research
2016-2022
Queen's Medical Centre
2016-2022
The Queen's Medical Research Institute
2017-2020
Engineering and Physical Sciences Research Council
2016-2020
University of Glasgow
2013-2017
Single-photon detectors based on superconducting nanowires (SSPDs or SNSPDs) have rapidly emerged as a highly promising photon-counting technology for infrared wavelengths. These devices offer high efficiency, low dark counts and excellent timing resolution. In this review, we consider the basic SNSPD operating principle models of device behaviour. We give an overview evolution design improvements in performance which been achieved. also evaluate limitations noise mechanisms. survey...
Abstract Improvement in secure transmission of information is an urgent need for governments, corporations and individuals. Quantum key distribution (QKD) promises security based on the laws physics has rapidly grown from proof-of-concept to robust demonstrations deployment commercial systems. Despite these advances, QKD not been widely adopted, large-scale will likely require chip-based devices improved performance, miniaturization enhanced functionality. Here we report low error rate, GHz...
This paper highlights a significant advance in time-of-flight depth imaging: by using scanning transceiver which incorporated freerunning, low noise superconducting nanowire single-photon detector, we were able to obtain centimeter resolution images of low-signature objects daylight at stand-off distances the order one kilometer relatively eye-safe wavelength 1560 nm.The detector used had an efficiency 18% 1 kHz dark count rate, and overall system jitter was ~100 ps.The acquired illuminating...
Photon sources are fundamental components for any quantum photonic technology. The ability to generate high count-rate and low-noise correlated photon pairs via spontaneous parametric down-conversion using bulk crystals has been the cornerstone of modern optics. However, future practical technologies will require a scalable integration approach, waveguide-based with high-count rate characteristics be an essential part chip-based technologies. Here, we demonstrate pair generation through...
Conventional imaging systems rely upon illumination light that is scattered or transmitted by the object and subsequently imaged. Ghost-imaging based on parametric down-conversion use twin beams of position-correlated signal idler photons. One beam illuminates an while image information recovered from a second has never interacted with object. In this Letter, we report camera-based ghost system where correlated photons have significantly different wavelengths. Infrared at 1550 nm wavelength...
Integrated photonics has enabled much progress towards quantum technologies. Many applications, including communication, sensing, and distributed cloud computing, will require coherent photonic interconnection between separate chip-based sub-systems. Large-scale computing systems architectures may ultimately interconnects to enable scaling beyond the limits of a single wafer "multi-chip" systems. However, coherently interconnecting chips is challenging due fragility these states demanding...
Direct monitoring of singlet oxygen (1O2) luminescence is a particularly challenging infrared photodetection problem. 1O2, an excited state the molecule, crucial intermediate in many biological processes. We employ low noise superconducting nanowire single-photon detector to record 1O2 at 1270 nm wavelength from model photosensitizer (Rose Bengal) solution. Narrow band spectral filtering and chemical quenching used verify signal, lifetime evolution with addition protein studied. Furthermore,...
Superconducting nanowire single-photon detectors (SNSPDs) have emerged as a highly promising infrared detector technology. Next-generation devices are being developed with enhanced detection efficiency (DE) at key technological wavelengths via the use of optical cavities. Furthermore, new materials and substrates explored for improved fabrication versatility, higher DE, lower dark counts. We report on practical performance packaged NbTiN SNSPDs fabricated oxidized silicon in wavelength range...
We demonstrate fast polarisation and path control of photons at 1550 nm in lithium niobate waveguide devices using the electro-optic effect. show heralded single photon state engineering, quantum interference, preparation two entangled feedback interference. These results point way to a platform that will enable integration nonlinear sources reconfigurable circuits for future photonic information science technology.
We demonstrate a distributed fiber Raman sensor for absolute temperature measurement with spatial resolution on the order of 1 cm at 1550 nm wavelength in single-mode using superconducting nanowire single-photon detectors. Rapid measurements are shown, less than 60 s integration period, allowing demonstration evolution an optical recorded over 100 resolvable, 1.2 spaced positions along simultaneously. This has potential application as primary reference standard, which high-accuracy,...
Integrated quantum photonic waveguide circuits are a promising approach to realizing future technologies. Here, we present an integrated technology platform utilising the silicon-on-insulator material system, where interference and manipulation of states light demonstrated in components orders magnitude smaller than previous implementations. Two-photon is presented multi-mode coupler, entanglement Mach-Zehnder interferometer, opening way all-silicon platform.
We present the generation of quantum-correlated photon pairs and subsequent pump rejection across two siliconon-insulator photonic integrated circuits.Incoherently cascaded lattice filters are used to provide over 100 dB pass-band stop-band contrast with no additional external filtering.Photon generated in a microring resonator successfully separated from input pump, confirmed by temporal correlations measurements.
We demonstrate the first 1550 nm correlated photon-pair source in an integrated glass platform-a chalcogenide As2S3 waveguide. A measured pair coincidence rate of 80 per second was achieved using 57 mW continuous-wave pump. The to accidental ratio shown be limited by spontaneous Raman scattering effects that are expected mitigated a pulsed pump source.
This paper describes how to evaluate the impact of a cyber attack on mission. We accomplish this by computing as changes mission measures effectiveness, based reported effects known or suspected one more parts information technology (IT) supporting Our previous papers have described our goals for and choices techniques we use modeling missions, IT, attacks. focuses compute attacks IT processes information. These computations will improve decision-making when under providing accurate detailed...
Twenty-nine Ortholoc II ultrahigh molecular weight polyethylene tibial components were retrieved from 27 patients at revision surgery the same hospital. The material grade, method of sterilization, and sterilization dosage for 26 determined by tracing lot number each component. Each surface was scored wear using a qualitative scoring system that evaluated delamination, pitting, scratching, cold flow, abrasion, burnishing. After score analysis, 14 analyzed to determine physical mechanical...
Superconducting nanowire single photon detectors (SNSPDs) are a key enabling technology for optical quantum information science. In this paper we demonstrate SNSPD fabricated on lithium niobate, an important material high speed integrated photonic circuits. We report system detection efficiency of 0.15% at 1 kHz dark count rate with maximum ~1% close to the critical current 1550 nm wavelength parallel wire front side illumination. There is clear scope improving performance further materials...
Abstract Practical quantum communication between remote memories rely on single photons at telecom wavelengths. Although spin-photon entanglement has been demonstrated in atomic and solid-state qubit systems, the produced short wavelengths with polarization encoding are not suitable for long-distance communication, because they suffer from high propagation loss depolarization optical fibres. Establishing nodes would further require generated separate to be indistinguishable. Here, we report...
Entanglement is a fundamental property of quantum mechanics, and primary resource in information systems. Its manipulation remains central challenge the development technology. In this work, we demonstrate device which can generate, manipulate, analyse two-qubit entangled states, using miniature mass-manufacturable silicon photonics. By combining four photon-pair sources with reconfigurable six-mode interferometer, embedding switchable entangling gate, generate manipulate their entanglement,...
Conjugation of dextran-coated superparamagnetic iron oxide (SPIO) particles with transactivator protein (Tat)-peptide and fluorescein isothiocyanate (FITC) allows cells to readily uptake SPIO particles. This makes possible high-resolution, real-time imaging these by magnetic resonance (MRI). First, we need understand how various subpopulations take up maintain In this report, have focused on differences in T cells, B macrophages respect cross-linked (CL)-SPIO Tat-FITC particle over 72 hours....
We demonstrate a high-accuracy distributed fiber-optic temperature sensor using superconducting nanowire single-photon detectors and counting techniques. Our demonstration uses inexpensive single-mode fiber at standard telecommunications wavelengths as the sensing fiber, which enables extremely low-loss experiments compatibility with existing networks. show that uncertainty of measurement decreases longer integration periods, but is ultimately limited by calibration uncertainty. Temperature...