One-way Quantum Key Distribution System based on Planar Lightwave Circuits

Details One-way Quantum Key Distribution System based on Planar Lightwave Circuits One-way Quantum Key Distribution System based on Planar Lightwave Circuits

2006-03-06

arxiv.org/abs/quant-ph/0603041v2

Jpn J. Appl. Phys. 45, 5344 (2006)

Physics

Quantum Physics

23 pages, 5 figures

Scientific paper

10.1143/JJAP.45.5344

We developed a one-way quantum key distribution (QKD) system based upon a planar lightwave circuit (PLC) interferometer. This interferometer is expected to be free from the backscattering inherent in commercially available two-way QKD systems and phase drift without active compensation. A key distribution experiment with spools of standard telecom fiber showed that the bit error rate was as low as 6% for a 100-km key distribution using an attenuated laser pulse with a mean photon number of 0.1 and was determined solely by the detector noise. This clearly demonstrates the advantages of our PLC-based one-way QKD system over two-way QKD systems for long distance key distribution.

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