Unconditionally secure quantum key-distribution with relatively strong signal pulse

Abstract

We propose an unconditionally secure quantum key distribution (QKD) protocol, which uses a relatively strong signal pulse. While our protocol shares similar security bases as the Bennett 1992 protocol with a strong reference pulse (B92), our scheme uses a smaller number of detectors and it is robust against Rayleigh scattering in an optical fibre. We derive a lower bound of secret key generation rate of our protocol and show that our protocol can cover relatively long distances, assuming precise phase modulations and stable interferometers.

4 pages

References in corpus (1)

• Quantum key distribution over 122 km of standard telecom fiber

Cited by in corpus (2)

• Robust Unconditionally Secure Quantum Key Distribution with Two Nonorthogonal and Uninformative States
• Security proof of differential phase shift quantum key distribution in the noiseless case