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Effects of Noise on the Security of Entanglement Swapping Based QKD Protocols

Authors:
Stefan Schauer
Martin Suda

Keywords: quantum key distribution; entanglement swapping; noisy channels; security analysis

Abstract:
In this article, we discuss the effects of noise in a quantum channel on the security of quantum key distribution protocols based on entanglement swapping. Therefore, we look at two different models of quantum noise, the depolarization channel and the decoherence channel. Based on these models, we examine at first the effects on entanglement swapping and further the implications on the security parameters in quantum cryptography. We are able to show that a fidelity of at least 0.9428 is necessary to guarantee the security of the protocol. Additionally, we take the exponential decrease of entanglement over the distance between the communication parties into account. Using the photonic channel with coherence lengths from 10 km to 50 km as a reference model, we find that in this scenario the maximum length of a quantum channel for secure communication based on entanglement swapping lies between 1.19 km and 6.12 km.

Pages: 23 to 27

Copyright: Copyright (c) IARIA, 2013

Publication date: August 25, 2013

Published in: conference

ISSN: 2308-3530

ISBN: 978-1-61208-303-2

Location: Barcelona, Spain

Dates: from August 25, 2013 to August 31, 2013