Quantum throughput: Quantifying quantum-communication devices with homodyne measurements

N. Killoran, H. Häseler, and N. Lütkenhaus
Phys. Rev. A 82, 052331 – Published 29 November 2010

Abstract

Quantum communication relies on optical implementations of channels, memories, and repeaters. In the absence of perfect devices, a minimum requirement on real-world devices is that they preserve quantum correlations, meaning that they have some throughput of a quantum-mechanical nature. Previous work has verified throughput in optical devices while using minimal resources. We extend this approach to the quantitative regime. Our method is illustrated in a setting where the input consists of two coherent states while the output is measured by two homodyne measurement settings.

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  • Received 26 August 2010

DOI:https://doi.org/10.1103/PhysRevA.82.052331

©2010 American Physical Society

Authors & Affiliations

N. Killoran1, H. Häseler1,2, and N. Lütkenhaus1,2

  • 1Institute for Quantum Computing and Department of Physics & Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
  • 2Max Planck Institute for the Physics of Light, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany

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Issue

Vol. 82, Iss. 5 — November 2010

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