GHz时钟速率下多用户网络中的量子密钥分发
Quantum Key Distribution in a Multi-User Network at Gigahertz Clock rates
摘要：
近年来，量子信息的研究已经导致发现了许多信息处理和通信的新范式。这些发展包括量子密码方案，提供由量子力学定律保证的无条件安全的信息传输。这种潜在的破坏性安全技术在未来可能具有很高的战略和经济价值。该领域的研究人员面临的两个主要问题是传输范围（通常<100 km）和密钥交换速率，在长光纤距离下，密钥交换速率可以低至每秒几位。本文描述了进一步研究的方法，以显着提高在1- 20公里范围内的距离的光纤系统中的密钥交换速率。我们将介绍一些应用场景的结果，包括点对点链路和多用户网络。已经开发了量子密钥分发系统，其使用标准电信光纤，并且能够以高达2GHz的时钟速率操作。他们实现了B 92协议的偏振编码版本，并采用发射波长为850 nm的垂直腔面发射激光器作为弱相干光源，以及硅单光子雪崩二极管作为单光子探测器。点对点量子密钥分发系统表现出1.4%的量子比特错误率，并且对于4.2 km的传输范围，估计的净比特率大于每秒100，000比特。
英文摘要：
In recent years quantum information research has lead to the discovery of a number of remarkable new paradigms for information processing and communication. These developments include quantum cryptography schemes that offer unconditionally secure information transport guaranteed by quantum-mechanical laws. Such potentially disruptive security technologies could be of high strategic and economic value in the future. Two major issues confronting researchers in this field are the transmission range (typically <100km) and the key exchange rate, which can be as low as a few bits per second at long optical fiber distances. This paper describes further research of an approach to significantly enhance the key exchange rate in an optical fiber system at distances in the range of 1-20km. We will present results on a number of application scenarios, including point-to-point links and multi-user networks. Quantum key distribution systems have been developed, which use standard telecommunications optical fiber, and which are capable of operating at clock rates of up to 2GHz. They implement a polarization-encoded version of the B92 protocol and employ vertical-cavity surface-emitting lasers with emission wavelengths of 850 nm as weak coherent light sources, as well as silicon single-photon avalanche diodes as the single photon detectors. The point-to-point quantum key distribution system exhibited a quantum bit error rate of 1.4%, and an estimated net bit rate greater than 100,000 bits- per second for a 4.2 km transmission range.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
