Direct estimation of decoherence rates

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Authors

BUŽEK Vladimír RAPČAN Peter RAU Jochen ZIMAN Mário

Year of publication 2012
Type Article in Periodical
Magazine / Source Physical Review A (Atomic, Molecular, and Optical Physics)
MU Faculty or unit

Faculty of Informatics

Citation
Web http://link.aps.org/doi/10.1103/PhysRevA.86.052109
Doi http://dx.doi.org/10.1103/PhysRevA.86.052109
Field Information theory
Keywords estimation; decoherence; unitary k designs
Description 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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