Direct estimation of decoherence rates

Vladimír Bužek, Peter Rapčan, Jochen Rau, and Mário Ziman
Phys. Rev. A 86, 052109 – Published 12 November 2012

Abstract

The decoherence rate is a nonlinear channel parameter that describes quantitatively the decay of the off-diagonal elements of a density operator in the decoherence basis. We address the question of how to experimentally access such a nonlinear parameter directly without the need for complete process tomography. In particular, we design a simple experiment working with two copies of the channel, in which the registered mean value of a two-valued measurement directly determines the value of the average decoherence rate. No prior knowledge of the decoherence basis is required.

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  • Received 12 July 2012

DOI:https://doi.org/10.1103/PhysRevA.86.052109

©2012 American Physical Society

Authors & Affiliations

Vladimír Bužek1, Peter Rapčan1, Jochen Rau2,3, and Mário Ziman1,4

  • 1Research Center for Quantum Information, Institute of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovak Republic
  • 2Institut für Angewandte Physik, Technische Universität Darmstadt, Hochschulstrasse 4a, 64289 Darmstadt, Germany
  • 3Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
  • 4Institute of Theoretical Physics, ETH Zürich, Switzerland

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Issue

Vol. 86, Iss. 5 — November 2012

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