Field Experimental "Star Type" Metropolitan Quantum Key Distribution Network
arXiv:0708.3546
Abstract
Quantum key distribution (QKD) network has recently attracted growing attentions. Due to the special characteristics of quantum information, to build a full-connectivity QKD network without trusted relays is a stimulating challenge. In this letter, we report on the first realization of QKD network without trusted relays which covers metropolis in the commercial backbone optical fiber networks. The star topology four-user QKD network automatically addresses the quantum signal with a quantum router (QR) and every user in the network can receive and distribute quantum keys to any others simultaneously. The longest and the shortest length of fibers between two geographically separated nodes are 42.6km and 32km respectively, and the maximum average quantum bit error rate (QBER) is below 8%. This result opens a new possibility for the use of QKD into existing network.
3 pages, 3 figures, 2 tables
References in corpus (6)
- Quantum Cryptography
- Quantum key distribution over 40 dB channel loss using superconducting single photon detectors
- Effects of detector efficiency mismatch on security of quantum cryptosystems
- Experimental Quantum Key Distribution with Decoy States
- Intrinsic-Stabilization Uni-Directional Quantum Key Distribution Between Beijing and Tianjin
- `Circular type' quantum key distribution