Passive Faraday-mirror attack in a practical two-way quantum-key-distribution system
Passive Faraday-mirror attack in a practical two-way quantum-key-distribution system
The Faraday mirror (FM) plays a very important role in maintaining the stability of two-way plug-and-play quantum key distribution (QKD) systems. However, the practical FM is imperfect, which will not only introduce an additional quantum bit error rate (QBER) but also leave a loophole for Eve to spy the secret …