Environment-assisted error correction of single-qubit phase damping

Benjamin Trendelkamp-Schroer, Julius Helm, and Walter T. Strunz
Phys. Rev. A 84, 062314 – Published 19 December 2011

Abstract

Open quantum system dynamics of random unitary type may in principle be fully undone. Closely following the scheme of environment-assisted error correction proposed by Gregoratti and Werner [J. Mod. Opt. 50, 915 (2003)], we explicitly carry out all steps needed to invert a phase-damping error on a single qubit. Furthermore, we extend the scheme to a mixed-state environment. Surprisingly, we find cases for which the uncorrected state is closer to the desired state than any of the corrected ones.

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  • Received 29 October 2011

DOI:https://doi.org/10.1103/PhysRevA.84.062314

©2011 American Physical Society

Authors & Affiliations

Benjamin Trendelkamp-Schroer, Julius Helm, and Walter T. Strunz

  • Institut für Theoretische Physik, Technische Universität Dresden, D-01062 Dresden, Germany

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Issue

Vol. 84, Iss. 6 — December 2011

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