Planar lightwave circuits for quantum cryptographic systems

2003/07/10 by Yoshihiro Nambu, Takaaki Hatanaka, Nambu, Yoshihiro +4 · 2 citations
Computer Science · Engineering · Physics and Astronomy · #Advanced Photonic Communication Systems #FOS: Physical sciences #Optical Network Technologies #Quantum Information and Cryptography #Quantum Physics (quant-ph) #quant-ph

paper · pdf · doi:10.48550/arxiv.quant-ph/0307074

Submitted to Electronics Letters

arxiv created 2003/07/10 · openalex publication_date 2003/07/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We propose a quantum cryptographic system based on a planar lightwave circuit (PLC) and report on optical interference experiments using PLC-based unbalanced Mach-Zehnder interferometers (MZIs). The interferometers exhibited high-visibility (>0.98) interference even when the polarisation in the optical fibre connecting the two MZIs was randomly modulated. The results demonstrate that a PLC-based setup is suitable for achieving a polarisation-insensitive phase-coding cryptographic system.

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• Attacks on fixed-apparatus quantum-key-distribution schemes

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