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Realization of error correction and reconciliation of continuous quantum key distribution in detail

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Science in China(Series F) 2009年第9期52卷 1598-1604页

作者： QIAN XuDong HE GuangQiang zeng guihua State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering ShanghaiJiao Tong University Shanghai 200030 China

The efficiency of reconciliation in the continuous key distribution is the main factor which limits the ratio of secret key distribution. However, the efficiency depends on the computational complexity of the algorithm. This paper optimizes the two main aspects of the reconciliation process of the continuous key distribution： the partition of interval and the estimation of bit. We use Gaussian approximation to effectively speed up the convergence of algorithm. We design the estimation function as the estimator of the SEC （sliced error correction） algorithm. Therefore, we lower the computational complexity and simplify the core problem of the reconciliation algorithm. Thus we increase the efficiency of the reconciliation process in the continuous key distribution and then the ratio of the secret key distribution is also increased.

关键词： continuous quantum key distribution reconciliation process optimal partition of interval SEC algorithm estimation function

Hybrid quantum private communication with continuous-variable and discrete-variable signals

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Science China(Physics,Mechanics & Astronomy) 2015年第2期58卷 14-20页

作者： LIU WeiQi PENG JinYe WANG Chao CAO ZhengWen HUANG Duan LIN DaKai HUANG Peng zeng guihua College of Information Science and Technology Northwest University State Key Laboratory of Advanced Optical Communication Systems and Networks and Center of Quantum Information Sensing and ProcessingShanghai Jiaotong University

The quantum key distribution(QKD) has been entering the practical application era. Subsequently, hybrid quantum private communication with discrete-variable signals, continuous-variable signals, and classic optical signals becomes inevitable in the practical scenario. In this paper, we experimentally investigated the mutual effects between the discrete-variable QKD(DVQKD) and the continuous-variable QKD(CVQKD) via a fiber channel. The experimental results show that the DVQKD will be influenced by the continuous-variable quantum signals and classic optical signals, while the CVQKD is not sensitive to the discrete-variable quantum signals.

关键词： hybrid quantum private communication Gaussian-modulated CVQKD protocol BB84 protocol mutual influences

Continuous-variable quantum key distribution based on continuous random basis choice

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Chinese Physics B 2018年第7期27卷 214-219页

作者： Weiqi Liu Jinye Peng Peng Huang Shiyu Wang Tao Wang guihua zeng College of Information Science and Technology Northwest UniversityXi＇an 710127China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Laboratory on Navigation and Location-based Serviceand Center of Quantum Information Sensing and Processing（QSIP）Shanghai Jiao Tong UniversityShanghai 200240China

Gaussian-modulated coherent state quantum key distribution is gradually moving towards practical application. Generally, the involved scheme is based on the binary random basis choice. To improve the performance and security, we present a scheme based on a continuous random basis choice. The results show that our scheme obviously improves the performance, such as the secure communication distance. Our scheme avoids comparing the measurement basis and discarding the key bits, and it can be easily implemented with current technology. Moreover, the imperfection of the basis choice can be well removed by the known phase compensation algorithm.

关键词： continuous-variable quantum key distribution basis choice

Secret key rate of continuous-variable quantum key distribution with finite codeword length

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Science China(Information Sciences) 2023年第8期66卷 150-151页

作者： Yan FENG Runhe QIU Kun ZHANG Xue-Qin JIANG Meixiang ZHANG Peng HUANG guihua zeng School of Information Science and Technology Donghua University School of Electronics and Information Soochow University School of Information Engineering Yangzhou University State Key Laboratory of Advanced Optical Communication Systems and Networks Center of Quantum Sensing and Information Processing (QSIP) Shanghai Jiao Tong University

In recent years, continuous-variable quantum key distribution(CV-QKD) has been proposed as a promising alternative to the most commonly implemented discrete-variable QKD [1]. A typical CV-QKD system includes mainly tw...

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Practical security of continuous-variable quantum key distribution under finite-dimensional effect of multi-dimensional reconciliation

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Chinese Physics B 2018年第5期27卷 101-107页

作者： Yingming Zhou Xue-Qin Jiang Weiqi Liu Tao Wang Peng Huang guihua zeng State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Laboratory on Navigation and Location-based Service and Center of Quantum Information Sensing and Processing(QSIP)Shanghai Jiao Tong UniversityShanghai 200240China College of Information Science and Technology Northwest UniversityXi'an 710127China School of Information Science and Technology Donghua UniversityShanghai 201620China

The well-known multi-dimensional reconciliation is an effective method used in the continuous-variable quantum key distribution in the long-distance and the low signal-to-noise-ratio *** virtual channel employed to exchange data is generally established by using a finite-dimensional rotation in the reconciliation *** this paper,we found that the finite dimension of the multi-dimensional reconciliation inevitably leads to the mismatch of the signal-to-noise-ratio between the quantum channel and the virtual channel,which may be called the finite-dimension *** an effect results in an overestimation on the secret key rate,and subsequently induces vital practical security loopholes.

关键词： multi-dimensional reconciliation finite-dimensional effect continuous-variable quantum key distribution

Round-trip multi-band quantum access network

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Photonics Research 2023年第8期11卷 1449-1464页

作者： YUEHAN XU TAO WANG HUANXI ZHAO PENG HUANG guihua zeng State Key Laboratory of Advanced Optical Communication Systems and Networks Center of Quantum Sensing and Information ProcessingShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum Sciences Shanghai 201315China Hefei National Laboratory CAS Center for Excellence in Quantum Information and Quantum PhysicsHefei 230026China

The quantum network makes use of quantum states to transmit data,which will revolutionize classical communication and allow for some breakthrough *** key distribution(QKD)is one prominent application of quantum networks,and can protect data transmission through quantum *** this work,we propose an expandable and cost-effective quantum access network,in which the round-trip structure makes quantum states travel in a circle to carry information,and the multi-band technique is proposed to support multiuser *** on the round-trip multi-band quantum access network,we realize multi-user secure key sharing through the continuous-variable QKD(CV-QKD)*** to the encoding characteristics of CV-QKD,the quadrature components in different frequency bands can be used to transmit key information for different *** feasibility of this scheme is confirmed by comprehensive noise analysis,and is verified by a proof-of-principle *** results show that each user can achieve excess noise suppression and 600 bit/s level secure key generation under 30 km standard fiber *** networks have the ability of multi-user access theoretically and could be expanded by plugging in simple ***,it paves the way for near-term largescale quantum secure networks.

关键词： networks network quantum

Gbps key rate passive-state-preparation continuous-variable quantum key distribution within an access-network area

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Photonics Research 2024年第7期12卷 1485-1493页

作者： FEIYU JI PENG HUANG TAO WANG XUEQIN JIANG guihua zeng State Key Laboratory of Advanced Optical Communication Systems and Networks Center for Quantum Sensing and Information ProcessingSchool of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum Sciences Shanghai 201315China Hefei National Laboratory Hefei 230088China College of Information Science and Technology Donghua UniversityShanghai 201620China

The conventional Gaussian-modulated coherent-state quantum key distribution(QKD) protocol requires the sender to perform active modulations based on a true random number generator. Compared with it, the passive-state-preparation(PSP) continuous-variable quantum key distribution(CVQKD) equivalently performs modulations passively by exploring the intrinsic field fluctuations of a thermal source, which offers the prospect of chip integration QKD with low cost. In this paper, we propose and experimentally demonstrate a high-rate PSP-CVQKD scheme within an access-network area using high-bandwidth detectors in a continuous wave encoding and decoding way. By proposing effective methods for suppressing the noises during the PSP process and polarization multiplexing to decrease the photon leakage noises, we realize the high-intensity local oscillator transmission, thereby achieving coherent detection with high efficiency, low noise, and high bandwidth. The secure key rates over transmission distance of 5.005 km with and without consideration of the finite-size effect are 273.25 Mbps and 1.09 Gbps. The use of the PSP method boosts the asymptotic secret key rate of CVQKD to Gbps level for the first time, to our knowledge, within the range of the access network, which provides an effective and secure key distribution strategy for high-speed quantum cryptography access communication.

关键词： passive network distribution

Robust continuous-variable quantum key distribution in the finite-size regime

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Photonics Research 2024年第11期12卷 2549-2558页

作者： YUEHAN XU TAO WANG XIAOJUAN LIAO YINGMING ZHOU PENG HUANG guihua zeng State Key Laboratory of Advanced Optical Communication Systems and Networks Center of Quantum Sensing and Information ProcessingShanghai Jiao Tong University Shanghai Research Center for Quantum Sciences Hefei National Laboratory Shanghai XT Quantech Co. Ltd.

Quantum key distribution(QKD) has been proven to be theoretically unconditionally secure. However, any theoretical security proof relies on certain assumptions. In QKD, the assumption in the theoretical proof is that the security of the protocol is considered under the asymptotic case where Alice and Bob exchange an infinite number of signals.

关键词： Matched filtering Phase noise Phase shift Quantum key distribution Signal processing Signal recovery

On-chip source-device-independent quantum random number generator

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Photonics Research 2024年第7期12卷 1379-1394页

作者： LANG LI MINGLU CAI TAO WANG ZICONG TAN PENG HUANG KAN WU guihua zeng State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China Institute of Quantum Sensing and Information Processing School of Sensing Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum Sciences Hefei National LaboratoryShanghai 201315China Shanghai Xun Tai Quantech Co. Ltd.Shanghai 200241China

Quantum resources offer intrinsic randomness that is valuable for applications such as cryptography, scientific simulation, and computing. Silicon-based photonics chips present an excellent platform for the cost-effective deployment of next-generation quantum systems on a large scale, even at room temperature. Nevertheless,the potential susceptibility of these chips to hacker control poses a challenge in ensuring security for on-chip quantum random number generation, which is crucial for enabling extensive utilization of quantum resources.

关键词： temperature quantum random