Author Affiliations
Abstract
School of Science, Beijing University of Posts and Telecommunications, Beijing 1008762 Department of Mathematics and Physics, North China Electric Power University, Beijing 102206
Due to the limit of response speed of the present single-photon detector, the code rate is still too low to come into practical use for the present quantum key distribution (QKD) system. A new idea is put up to design a quick single-photon detector. This quick single-photon detector is composed of a multi-port optic-fiber splitter and many avalanche photo diodes (APDs). All of the ports with APDs work on the time division and cooperate with a logic discriminating and deciding unit driven by the clock signal. The operation frequency lies on the number N of ports, and can reach N times of the conventional single-photon detector. The single-photon prompt detection can come true for high repetition-rate pulses. The applying of this detector will largely raise the code rate of the QKD, and boost the commercial use.
单光子探测器 雪崩二极管 量子通信 量子密钥分配 码率 时分模式 040.5160 Photodetectors 060.4510 Optical communications 230.5160 Photodetectors 270.5570 Quantum detectors Chinese Optics Letters
2008, 6(5): 320
Author Affiliations
Abstract
The Key Laboratory of Optical Communication and Lightwave Technologies, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876
We experimentally demonstrate amplitude squeezed soliton utilizing intensity-dependent self-phase modulation in an asymmetric Sagnac interferometer. The system, whose components are connected via ferrule connector/physical connection (FC/PC) fiber connectors, constitutes all-fiber configuration to generate squeezed soliton. Soliton amplitude reduction measured by homodyne detection is near 4.0 dB below the shot-noise level. Optimal squeezing fields in both simple and compact all-fiber configuration are obtained.
光孤子 压缩态 零拍探测 270.6570 Squeezed states 190.5530 Pulse propagation and temporal solitons 190.4370 Nonlinear optics, fibers Chinese Optics Letters
2008, 6(2): 02141