相敏放大器增强高速连续可变量子密钥分配的实验论证

IF 8.3 1区 物理与天体物理 Q1 PHYSICS, APPLIED
Jinpeng Liao, Zhirong Chen, Jintao Wang, Hao Xiao, Xiaojie Guo, Zhaohui Li, Dawei Wang
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引用次数: 0

摘要

采用连续变量的系统类型,如光场正交信号调制,是量子密钥分配的一个重要分支。利用量子密钥分发技术实现高密钥速率有利于实现更频繁的密钥更新或实现高速通信任务的一次性键盘加密。然而,典型的大带宽平衡光电探测器的缺陷阻碍了连续可变量子密钥分配与最先进的经典光通信速度相匹配。以前提高密钥率的尝试主要集中在设计和制造高速平衡光电探测器上。众所周知,相敏放大器也提高了平衡光电探测器的性能,从而提高了密钥分配的性能,但这个概念仍然是纯理论的。在这里,我们首次通过实验证明了高速连续可变量子密钥分配与10 GHz平衡光电探测器一起工作,该探测器通过相敏放大和检测增强。为了适应相敏操作,采用了一种共轭多模连续变量协议。光放大器使光电探测器的清除率(量子噪声比电噪声高)提高了10 dB,并将探测效率从72%提高到96%,从而通过16.7公里的现场部署光纤实现248.9 Mb/s的密钥分发速率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Experimental demonstration of high-speed continuous variable quantum key distribution enhanced by phase-sensitive amplifier

Experimental demonstration of high-speed continuous variable quantum key distribution enhanced by phase-sensitive amplifier

The type of system employing continuous variables, such as light field quadrature for signal modulation, is an important branch for quantum key distribution. Achieving a high key rate using quantum key distribution technology is beneficial for realizing more frequent key updates or enabling one-time pad encryption for high-speed communication tasks. However, the deficiencies of typical large-bandwidth balanced photodetectors prevent the continuous variable quantum key distribution from matching the speed of state-of-the-art classical optical communications. Previous attempts to improve the key rate have focused on designing and manufacturing high-speed balanced photodetectors. It is well known that phase-sensitive amplifiers also improve the performance of balanced photodetectors and thus the performance of key distribution, but the concept remains purely theoretical. Here, for the first time, we experimentally demonstrate a high-speed continuous-variable quantum key distribution operating with a 10 GHz balanced photodetector enhanced by phase-sensitive amplification and detection. A conjugated multi-mode continuous variable protocol is used to accommodate the phase-sensitive operations. The optical amplifier offers a 10 dB increase in the photodetector’s clearance (quantum noise over electrical noise) and improves the detection efficiency from 72% to 96%, thus enabling an overall 248.9 Mb/s key distribution rate through a 16.7 km field-deployed optical fiber.

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来源期刊
npj Quantum Information
npj Quantum Information Computer Science-Computer Science (miscellaneous)
CiteScore
13.70
自引率
3.90%
发文量
130
审稿时长
29 weeks
期刊介绍: The scope of npj Quantum Information spans across all relevant disciplines, fields, approaches and levels and so considers outstanding work ranging from fundamental research to applications and technologies.
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