Single-photon interference experiment over 100 km for quantum cryptography system using a balanced gated-mode photon detector

摘要

We demonstrate single-photon interference over 100 km using a balancedgated-mode photon detector and a plug & play system for quantum keydistribution. The visibility with 0.1 photon/pulse was more than 80% after 100km transmission. This corresponds to the fidelity of a quantum cryptographysystem of more than 90% and a QBER of less than 10%, satisfying the securitycriteria.