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Information communicated by entangled photon pairs

Barnett, Steve (2012) Information communicated by entangled photon pairs. Physical Review A, 85. ISSN 1050-2947

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Abstract

A key goal of quantum communication is to determine the maximum number of bits shared between two quantum systems. An important example of this is in entanglement-based quantum key distribution (QKD) schemes. A realistic treatment of this general communication problem must take account of the nonideal nature of the entanglement source and the detectors. The aim of this paper is to give such a treatment. We obtain analytic expression for the mutual information in terms of experimental parameters. The results are applied to communication schemes that rely on spontaneous parametric down conversion to generate entangled photons. We show that our results can be applied to tasks such as calculating the optimal rate of bits per photon in high-dimensional time-bin-encoded QKD protocols (prior to privacy amplification). A key finding for such protocols is that, by using realistic experimental parameters, one can obtain over 10 bits per photon. We also show how our results can be applied to characterize the capacity of a fiber array and to quantify entanglement using mutual information.

Item type: Article
ID code: 39944
Keywords: photon pairs , quantum systems , detectors , photons, Optics. Light, Atomic and Molecular Physics, and Optics
Subjects: Science > Physics > Optics. Light
Department: Faculty of Science > Physics
Depositing user: Pure Administrator
Date Deposited: 06 Jun 2012 14:21
Last modified: 21 May 2015 14:37
Related URLs:
URI: http://strathprints.strath.ac.uk/id/eprint/39944

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