Alibaba Group Holding Limited

Junying Pang

Xiuzhong Chen

Yingfang Fu

Chongjin Xie

Shuanlin Liu

Yabin Gao

Li Xiao

Liang Feng

A method and apparatus for quantum key distribution comprised of a privacy amplification method and device for the quantum key distribution process as well as a data transmission method and system based on quantum keys is provided, wherein the quantum key distribution method includes the following process: obtaining a bit stream of the same basis vector by sending or receiving coding quantum states of random bit streams and comparing those measurements obtained with the measurement basis vector; in accordance with a preset manner, extracting parameter information associated with privacy amplification and initial key information from the bit stream of the same basis vector after error correction; and using the initial key as an input to implement the privacy amplification algorithm based on the parameter information and thereby obtain shared quantum keys. Utilization of the method detailed herein can eliminate security risks in the negotiation of privacy amplification parameters in the alternative channel and effectively improve the security of quantum key distribution processes.

Method, apparatus, and system for quantum key distribution, privacy amplification, and data transmission

A method and device for detecting shared risk link groups is disclosed. The method comprises injecting a probe beam, respectively, into a first test link and a second test link. The method further includes recording, respectively, a first curve of a time-varying first power corresponding to the first backlight and a second curve of a time-varying second power corresponding to the second backlight; calculating a resemblance value for the first curve and the second curve; and judging, based on the resemblance value, whether the first test link and the second test link are located in the same shared risk link group. The method and device for detecting shared risk link groups provided by embodiments of the present invention detect by testing a power characteristic of backlight of a probe beam in test links and, based on that one-dimensional power characteristic, judge whether the test links are in the same shared risk link group, which are simpler in application than those in the prior art.

Method and apparatus for detecting shared risk link groups

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Hangzhou, China

Junying Pang