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Phase-covariant quantum benchmarks

J. Calsamiglia, M. Aspachs, R. Muñoz-Tapia, and E. Bagan
Phys. Rev. A 79, 050301(R) – Published 8 May 2009

Abstract

We give a quantum benchmark for teleportation and quantum storage experiments suited for pure and mixed test states. The benchmark is based on the average fidelity over a family of phase-covariant states and certifies that an experiment cannot be emulated by a classical setup, i.e., by a measure-and-prepare scheme. We give an analytical solution for qubits, which shows important differences with standard state estimation approach, and compute the value of the benchmark for coherent and squeezed states, both pure and mixed.

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  • Received 31 July 2008

DOI:https://doi.org/10.1103/PhysRevA.79.050301

©2009 American Physical Society

Authors & Affiliations

J. Calsamiglia, M. Aspachs, R. Muñoz-Tapia, and E. Bagan

  • Grup de Física Teòrica, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain

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Issue

Vol. 79, Iss. 5 — May 2009

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