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RIVF International Conference on Computing and Communication Technologies (RIVF)

Towards Quantum Key Distribution System using Homodyne Detection with Differential Time-Multiplexed Reference

Qing Xu, Marcia Costa e Silva, Jean‐Luc Danger, Sylvain Guilley, Patrick Bellot, Philippe B. Gallion, Francisco Javier Mendieta

Published Mar 1, 2007• 8 citations
Publisher

Abstract

In this work we present the principles and experimental demonstration of a BB84 quantum key distribution (QKD) one way system using fainted pulses and a quadrature phase-shift-keying (QPSK) format including a time- multiplexed unmodulated carrier reference at Alice's end, and a differential homodyne reception at Bob's end. We also describe the secure electronics interface subsystem concept for the interaction with upper layers in an IP application.

DOI
10.1109/rivf.2007.369151

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In this work we present the principles and experimental demonstration of a BB84 quantum key distribution (QKD) one way system using fainted pulses and a quadrature phase-shift-keying (QPSK) format including a time- multiplexed unmodulated carrier reference at Alice's end, and a differential homodyne reception at Bob's end. We also describe the secure electronics interface subsystem concept for the interaction with upper layers in an IP application.
This paper presents the principles and experimental results of an optical fiber QKD system operating at 1550 nm, and using the BB84 protocol with QPSK signals. Our experimental setup consists of a time-multiplexed super-homodyne configuration using P.I.N detectors in a differential scheme as an alternative to avalanche photon counting. Transmission over 11km of optical fiber has been done using this detection scheme and major relevant characteristics such as noise, quantum efficiency and bit error rate (BER) are reported.
Quantum key distribution (QKD) has emerged as a revolutionary technique that can ensure unconditionally secure communication between two distant parties, referred to as Alice and Bob, by exploiting the fundamental principles of quantum physics. Here, we report experimental demonstration of a fully automated QKD system based on the BB84 protocol. A weak coherent pulse source is developed to generate stream of polarization encoded single photons. Our QKD system demonstrates a low QBER of ∼1.2% with sifted key generation rate of ∼70 Kbps at an average photon number per pulse ofμ=0.11\mu=0.11μ=0.11. The final secure key rate of ∼33 Kbps is achieved after performing post processing procedures viz. error correction and privacy amplification. The quantum communication link is established continuously for several hours and the performance is evaluated iteratively. The developed QKD system is shown to have the capability of distributing cryptographic keys securely and seamlessly, under practical operating conditions. Furthermore, we have successfully demonstrated unconditionally secure transmission and reception of an image between Alice and Bob connected over an unsecured public channel by utilizing quantum cryptography.