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IEEE/LEOS Summer Topical Meetings

Practical one-way quantum cryptographic system for telecom networks

Zhiliang L. Yuan, Andrew J. Shields

Published Sep 22, 2006• 0 citations
Publisher

Abstract

We present a one-way quantum key distribution system with active phase compensation. The system is characterized by a quantum bit error rate of 2.23% and a secure key rate of 24.4 kbps
DOI
10.1109/leosst.2006.1694000

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Current technological progress is driving Quantum Key Distribution towards a commercial and worldwide scale expansion. Its capability to deliver secure communication regardless of the computational power of the attackers will be a fundamental feature in the next generations of telecommunication networks. Nevertheless, demonstrations of QKD implementation in a real operating scenario and their coexistence with the classical telecom infrastructure are of fundamental importance for reliable exploitation. Here we present a Quantum Key Distribution application implemented over a classical fiber-based infrastructure. We exploit a 50 MHz source at 1550 nm, a single 13 km-long fiber cable for both the quantum and the classical channel, and a simplified receiver scheme with just one single-photon detector. In this way, we achieve an error rate of approximately 2% and a secret key rate of about 1.7 kbps, thus demonstrating the feasibility of low-cost and ready-to-use Quantum Key Distribution systems compatible with standard classical infrastructure.