Experimental composable security decoy-state quantum key distribution using time-phase encoding

Abstract

Quantum key distribution (QKD) promises provably secure communications. In order to improve the secret key rate, combining a biased basis choice with the decoy-state method is proposed. Concomitantly, there is a basis-independent detection efficiency condition, which usually cannot be satisfied in a practical system, such as the time-phase encoding. Fortunately, this flaw has been recently removed theoretically and experimentally using the fact that the expected yields of single-photon states prepared in two bases stay the same for a given measurement basis. However, the security proofs do not fully consider the finite-key effects for general attacks. In this work, we provide the rigorous finite-key security bounds for four-intensity decoy-state BB84 QKD against coherent attacks in the universally composable framework. Furthermore, we build a time-phase encoding system with 200 MHz clocked to implement this protocol, in which the real-time secret key rate is more than 60 kbps over 50 km single-mode fiber.

5 pages, 1 figure

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• Homodyne Detection Quadrature Phase Shift Keying Continuous-Variable Quantum Key Distribution with High Excess Noise Tolerance
• Discrete-Modulated Continuous-Variable Quantum Key Distribution in Satellite-to-Ground Communication
• Time-bin encoded quantum key distribution over 120 km with a telecom quantum dot source
• Finite-key security analysis of the decoy-state BB84 QKD with passive measurement
• Security of the BB84 protocol with passive biased basis choice by the receiver