Quantum key distribution protocol without monitoring for a disturbance

Abstract

A quantum key distribution enables us to share a secure random bit sequence between two parties. Its security is supposed to be based on the property that any attempt to distinguish encoded quantum states causes a disturbance in the signal. In this article, we introduce a Round-Robin Differential Phase-Shift (RRDPS) quantum key distribution protocol as a new protocol that can guarantee security without monitoring for a disturbance. It makes a noisy channel available for quantum key distribution.