Multipair signal states in entanglement-based quantum cryptography

Miloslav Dusek; Kamil Bradler

doi:10.1117/12.545078

21 November 2003 Multipair signal states in entanglement-based quantum cryptography

Miloslav Dusek, Kamil Bradler

Proceedings Volume 5259, 13th Polish-Czech-Slovak Conference on Wave and Quantum Aspects of Contemporary Optics; (2003) https://doi.org/10.1117/12.545078
Event: 13th Polish-Czech-Slovak Conference on Wave and Quantum Aspects of contemporary Optics, 2002, Krzyzowa, Poland

Abstract

Pairs of entangled photons can be employed for quantum key distribution. For each bit exactly one pair of photons is needed. Unfortunately, the quantum states produced by real sources, like a parametric down conversion, contain also terms with more than only one photon pair. We discuss several aspects of the use of such states for quantum key distribution. It is shown that the presence of multi-pair signals (together with low detection efficiencies) causes errors in transmission even in the absence of al1 eavesdropper. However, the most important result is that an individual eavesdropping on multi-pair signals increases the error rate. This fact represents the important advantage of the entanglement-based quantum key distribution.

Citation Download Citation

Miloslav Dusek and Kamil Bradler "Multipair signal states in entanglement-based quantum cryptography", Proc. SPIE 5259, 13th Polish-Czech-Slovak Conference on Wave and Quantum Aspects of Contemporary Optics, (21 November 2003); https://doi.org/10.1117/12.545078

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