Experimental Study on Practical Quantum Key Distribution Scheme with Time-Multiplexed Technique
Huang Yu-Xian, Hu Hua-Peng, Ruisheng Liang, Lu Yi-Qun, Jindong Wang, Wei Lü · Chinese Physics Letters · 2008
We present a scheme that is capable of detecting photon numbers during the quantum key distribution (QKD) based on an improved differential phase shift (DPS) system without Trojan horse attack. A time-multiplexed detector (TMD) is set in for the photon-number resolution. Two fibre loops are used for detecting photon numbers as well as distributing keys. The long-term stabilization is guaranteed by two Faraday mirrors (FM) at Bob's site to automatically compensate for polarization defect. Our experimental study (90km QKD is completed) indicates that such a system is stable and secure which nearly reaches the performance of a single photon scheme.