Security analysis of quantum cryptography with modified coherent state

Ya Jun Lu; Zhe Yu Ou

doi:10.1117/12.561718

19 October 2004 Security analysis of quantum cryptography with modified coherent state

Ya Jun Lu, Zhe Yu Ou

Proceedings Volume 5551, Quantum Communications and Quantum Imaging II; (2004) https://doi.org/10.1117/12.561718
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

A modified coherent state is created by mixing a coherent state with optical field from parametric down-conversion in a beam splitter. A two-photon interference effect will cancel the two-photon state. This modified coherent state has ad-vantage over the conventional weak coherent state currently used widely in quantum cryptography. We make numerical analysis on the improvement in secure data rate and transmission distance with the modified coherent state. With a three-photon interference effect to cancel the three-photon state, further improvement is shown to be possible in a newly proposed protocol for quantum cryptography.

Citation Download Citation

Ya Jun Lu and Zhe Yu Ou "Security analysis of quantum cryptography with modified coherent state", Proc. SPIE 5551, Quantum Communications and Quantum Imaging II, (19 October 2004); https://doi.org/10.1117/12.561718

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