A5105456498- Quantum Information and Cryptography
- Advanced Fiber Laser Technologies
- Quantum Computing Algorithms and Architecture
- Optical Network Technologies
- Advanced Photonic Communication Systems
- Quantum Mechanics and Applications
- Advanced Frequency and Time Standards
- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Quantum optics and atomic interactions
- Photonic Crystal and Fiber Optics
- Semiconductor Lasers and Optical Devices
- Chaos-based Image/Signal Encryption
- Atomic and Subatomic Physics Research
- Quantum-Dot Cellular Automata
- Network Time Synchronization Technologies
- Optical Wireless Communication Technologies
- Quantum and electron transport phenomena
- Advanced Optical Network Technologies
- PAPR reduction in OFDM
- Random lasers and scattering media
- Optical Coherence Tomography Applications
- Spectroscopy and Laser Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Neural Networks and Reservoir Computing
Beijing University of Posts and Telecommunications
2016-2025
State Key Laboratory of Information Photonics and Optical Communications
2014-2024
Qingdao University
2024
Guangxi University of Science and Technology
2024
China Institute of Atomic Energy
2024
Shanghai Jiao Tong University
2011-2024
Dalian University of Technology
2024
Naval University of Engineering
2023
Chang'an University
2023
Heilongjiang University
2013-2014
This article has been selected for the Anesthesiology CME Program. After reading article, go to http:// www.asahq.org/journal-cme take test and apply Category 1 credit. Complete instructions may be found in section at back of this issue. PRACTICE guidelines are systematically developed recommendations that assist practitioner patient making decisions about health care. These adopted, modified, or rejected according clinical needs constraints. Practice not intended as standards absolute...
Quantum key distribution provides secure keys resistant to code-breaking quantum computers. The continuous-variable version of offers the advantages higher secret rates in metropolitan areas, as well use standard telecom components that can operate at room temperature. However, transmission distance these systems (compared with discrete-variable systems) are currently limited and considered unsuitable for long-distance distribution. Herein, we report experimental results long over 202.81 km...
Privacy amplification is an indispensable step in postprocessing of continuous-variable quantum key distribution (CV-QKD), which used to distill unconditional secure keys from identical corrected between two distant legal parties. The processing speed privacy has a significant effect on the secret rate CV-QKD system. We report high-speed parallel implementation length-compatible algorithm based graphic unit. Length-compatible satisfy security requirement at different transmission distances...
The continuous-variable version of quantum key distribution (QKD) offers the advantages (over discrete-variable systems) higher secret rates in metropolitan areas as well use standard telecom components that can operate at room temperature. An important step real-world adoption QKD is deployment field tests over commercial fibers. Here we report two different a system through fiber networks Xi'an and Guangzhou distances 30.02 km (12.48 dB) 49.85 (11.62 dB), respectively. We achieve secure...
Abstract Continuous-variable quantum key distribution (CVQKD) offers the specific advantage of sharing keys remotely by use standard telecom components, thereby promoting cost-effective and high-performance metropolitan applications. Nevertheless, introduction high-rate spectrum broadening has pushed CVQKD from a single-mode to continuous-mode region, resulting in adoption modern digital signal processing (DSP) technologies recover quadrature information states. However, security proof DSP...
Quantum key distribution provides secure keys with information-theoretic security ensured by the principle of quantum mechanics. The continuous-variable version using coherent states offers advantages its compatibility telecom industry, e.g., commercial laser and homodyne detector, is now going through a booming period. In this review article, we describe system; focus on protocols based states, whose systems are gradually moving from proof-of-principle lab demonstrations to in-field...
A continuous-variable measurement-device-independent quantum key distribution (CV-MDI QKD) protocol using squeezed states is proposed where the two legitimate partners send Gaussian-modulated to an untrusted third party realize measurement. Security analysis shows that can not only defend all detector side channels, but also attain higher secret rates than coherent-state-based protocol. We present a method improve squeezed-state CV-MDI QKD by adding proper Gaussian noise reconciliation side....
Balanced homodyne detector (BHD) that can measure the field quadratures of coherent states has been widely used in a range quantum information technologies. Generally, BHD tends to suffer from narrow bands and an expanding bandwidth behavior usually traps into compromise with gain, electronic noise, classical noise ratio, etc. In this paper, we design construct wideband based on radio frequency integrated circuit technology. Our shows up 1.2 GHz its ratio is around 18 dB. Simultaneously,...
Can encrypted communication be secure at practical speeds? The authors propose a $r\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}l\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}s\phantom{\rule{0}{0ex}}s$...
The M-ary support vector machine (SVM) is introduced as a nonparameter nonlinear phase noise (NLPN) mitigation approach for the coherent optical systems. NLPN tolerance of system can be improved by using SVM to conduct detection. In this scheme, SVMs with different classification strategies are utilized execute binary signals impaired fiber NLPN. Since separating hyperplane each constructed training data, scheme independent from knowledge transmission link. numerical simulation, performs...
The method of improving the performance continuous-variable quantum key distribution protocols by postselection has been recently proposed and verified. In measurement-device-independent (CV-MDI QKD) protocols, measurement results are obtained from untrusted third party Charlie. There is still not an effective CV-MDI QKD with measurement. We propose a to improve coherent-state protocol virtual photon subtraction via non-Gaussian postselection. transmitted data equivalent ideal on two-mode...
We study the impact of finite-size effect on continuous-variable measurement-device-independent quantum key distribution (CV-MDI QKD) protocol, mainly considering parameter estimation procedure. The central-limit theorem and maximum likelihood are used to estimate parameters. also analyze relationship between number exchanged signals optimal modulation variance in protocol. It is proved that when Charlie's position close Bob, CV-MDI QKD protocol has farthest transmission distance scenario....
Traditional microwave photonic systems cannot implement frequency up-conversion with phase tunable capability, which plays an important role for array beamforming. Here, a method that can both upconversion and downconversion broadband full-degree phase-shift capability by constructing optical path Hilbert transform function is presented. Owing to the path, dual-drive Mach-Zehnder modulator (DMZM) bias information, initially influences amplitudes of output signals, are transferred their...
Quantum key distribution, which ensures information-theoretically secret generation, is currently advancing through photonic integration to achieve high performance, cost reduction, and compact size, thereby facilitating the large-scale deployment. Continuous-variable quantum distribution an attractive approach for integrations due its compatibility with off-the-shelf optical communication devices. However, chip-based systems have encountered significant limitations primarily related...
By investigating the spectrum property of frequency offset in an optical coherent <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">M</i> -ary phase-shift-keying system, a estimation is presented based on fast Fourier transform signal's argument. Different from previous algorithms, it does not require removing modulated data phase. The principle algorithm proven and flowchart proposed to illustrate algorithm. Numerical simulations are performed demonstrate
A method to realize a highly linear microwave photonics link is proposed based on the dual-drive dual-parallel Mach-Zehnder modulator (MZM). The scheme theoretically eliminates third-order intermodulation distortion (IMD3) completely by taking all sidebands in optical spectrum that cause IMD3 into consideration. Without digital linearization and other processors, utilizes simple electrical signal phase control. Microwave signals are symmetrically single sideband modulated two MZMs....
Abstract Error correction is a significant step in postprocessing of continuous-variable quantum key distribution system, which used to make two distant legitimate parties share identical corrected keys. We propose an experiment demonstration high speed error with multi-edge type low-density parity check (MET-LDPC) codes based on graphic processing unit (GPU). GPU supports calculate the messages MET-LDPC simultaneously and decode multiple codewords parallel. optimize memory structure matrix...
A microwave photonic frequency downconversion system with wideband and continuous phase-shift function is proposed experimentally demonstrated. In the system, a radio (RF) local oscillator (LO) signal drive two arms of dual-drive Mach-Zehnder modulator (DMZM). fiber Bragg grating (FBG) used for reflecting first-order sidebands both RF LO signals. Due to phase independence between optical sidebands, phase-shifting operation an output intermediate (IF) can be implemented either by adjusting...
The shot-noise unit (SNU) is a crucial factor for the practical security of continuous-variable quantum key distribution system. In most widely used experimental scheme, SNU should be calibrated first and acts as constant during distribution. However, system dependent on various parameters local oscillator (LO), which can controlled by eavesdropper in open channel. this paper, we report hacking method to control using limited compensation rate polarization compensation. Since only based...
We demonstrate a 6 Gbps real-time optical quantum random number generator by measuring vacuum fluctuation. To address the common problem that speed gap exists between fast randomness generation and slow extraction in most high-speed systems, we present an optimized algorithm based on parallel implementation of Toeplitz hashing to reduce influence classical noise due imperfection devices. Notably, rate have achieved reaches highest 12 occupying less computing resources has ability support...