A5102734107- Quantum Information and Cryptography
- Quantum Mechanics and Applications
- Orbital Angular Momentum in Optics
- Quantum optics and atomic interactions
- Advanced Optical Sensing Technologies
- Quantum Computing Algorithms and Architecture
- Ocular and Laser Science Research
- Molecular Communication and Nanonetworks
- Space Science and Extraterrestrial Life
- Radiation Therapy and Dosimetry
- Space Satellite Systems and Control
- Remote Sensing and LiDAR Applications
- Spacecraft Design and Technology
- Advanced Semiconductor Detectors and Materials
- Photonic and Optical Devices
- Mechanical and Optical Resonators
- Neural Networks and Reservoir Computing
- Optical Wireless Communication Technologies
- Radiation Effects in Electronics
- Space exploration and regulation
- Advanced Fluorescence Microscopy Techniques
University of Bristol
2021-2024
Nanjing University of Science and Technology
2018
Abstract Quantum key distribution (QKD) provides a method of ensuring security using the laws physics, avoiding risks inherent in cryptosystems protected by computational complexity. Here, authors investigate feasibility satellite‐based quantum exchange low‐cost compact nano‐satellites. The first prototype system level aimed at Cube satellite scenario is demonstrated. It consists transmitter payload, ground receiver and simulated free space channel to verify timing synchronisation (T&S)...
Satellite-based, long-distance free-space quantum key distribution has the potential to realise global secure communication networks. Detecting faint optical pulses sent from space requires highly accurate and robust classical timing systems pick out signals noise allow for reconciliation of received bits. For such high-loss applications, a fault-tolerant synchronisation signal coding decoding scheme based on de Bruijn sequences is proposed. A representative system was tested in laboratory...
Satellite based Quantum Key Distribution (QKD) in Low Earth Orbit (LEO) is currently the only viable technology to span thousands of kilometres. Since typical overhead pass a satellite lasts for few minutes, it crucial increase signal rate maximise secret key length. For QUARC CubeSat mission due be launched within two years, we are designing dual wavelength, weak-coherent-pulse decoy-state Bennett-Brassard '84 (WCP DS BB84) QKD source. The optical payload designed $12{\times}9{\times}5...
Next generation communications will require the exploration of alternatives to existing technologies enable end-to-end connections for secure data exchange. 5G presents advanced connectivity opportunities even remote rural areas. However, platforms benefit from complementary methods enhance network capabilities and fulfill trust requirements. Due high throughput links, high-beam directivity, energy efficiency, free-space optics (FSO) is an alternative solution with potential deliver...
This paper investigates the signal to interference plus noise ratio (SINR) performance of imaging laser radar (ILR) system operating at a wavelength 905 nm using an avalanche photodiode array under fog condition.We analysis glow image light source, which is formed by spot irradiated on standard Lambertian target.Based proposed theoretical model, we determine due inter-channel crosstalk different conditions for targeted channel.We show that, transmission spans less than several tens meters...
Quantum key distribution (QKD) is a theoretically proven future-proof secure encryption method that inherits its security from fundamental physical principles. Craft Prospect, working with number of UK organisations, has been focused on miniaturising the technologies enable QKD so they may be used in smaller platforms including nanosatellites. The significant reduction size, and therefore cost launching quantum communication either dedicated platform or hosted as part larger optical...
A low false alarm rate in smoke has always been chasing after pulse laser ranging system. Smoke distributes particularly random space so that different distributions produce distinct interference echoes even if they are under same attenuation degree. Based on the theory of single scattering, this paper echo-element superposition model is established to study relationship between backscattering and thickness condition but spatial distribution. The analysis shows at a constant threshold, width...
Cube-satellites promise a flexible platform for global scale QKD but limited SWaP leads to design challenges. We present payload engineering module the UK SPOQC mission highlighting low volume and high key rate.
Abstract Long‐distance free space quantum key distribution based on CubeSats can be used to establish global secure communication networks, with potential commercial applications benefitting from the low cost of its design and launch. Detecting single‐photon level optical pulses sent requires highly accurate robust timing systems pick out signals noise. For such high‐loss applications, we envisage a low‐repetition (sub‐MHz) beacon laser emitting short (ns) high‐peak‐power which interpolated...
Satellite QKD enables quantum-secure communications at global scale. However, practical systems require high-rate, low size, weight and power photon sources ground stations. We present enabling CubeSat missions demonstrate their interoperation.
Quantum key distribution (QKD) provides a method of ensuring security using the laws physics, avoiding risks inherent in cryptosystems protected by computational complexity. Here we investigate feasibility satellite-based quantum exchange low-cost compact nano-satellites. This paper demonstrates first prototype system level aimed at Cube satellite scenario. It consists transmitter payload, ground receiver and simulated free space channel to verify timing synchronisation (T&S) scheme designed...
Inspired by quantum rangefinding, a three-channel frequency-agile optical source was demonstrated for rangefinding scheme experimentally, maintaining the advantage of high noise rejection, and realizing six orders magnitude brightness enhancement compared to illumination.