Phase-covariant quantum benchmarks
Calsamiglia Costa, John (Universitat Autònoma de Barcelona. Departament de Física)
Aspachs Bracons, Mariona (Universitat Autònoma de Barcelona. Departament de Física)
Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física)
Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física)
American Physical Society

Date:	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.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	Physical review. A, Vol. 79, Issue 5 (May 2009) , p. 050301-1-050301-4, ISSN 1050-2947

DOI: 10.1103/PhysRevA.79.050301

4 p, 114.7 KB

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