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Optica Publishing Group
  • The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meeting
  • OSA Technical Digest (online) (Optica Publishing Group, 2013),
  • paper T5A.2
  • https://doi.org/10.1364/QIM.2013.T5A.2

Restoration of Quantum Entanglement Via Environment-Assisted Error Correction

Open Access Open Access

Abstract

In this talk, I will present an explicit scheme to fully recover a multiple-qubit state subject to a phase damping noise. We establish the theoretical framework and the operational procedure to restore an unknown initial quantum state for an N-qubit model interacting with either individual baths or a common bath. We give an explicit construction of the random unitary (RU) Kraus decomposition for an N-qubit model interacting with a common bath. We also demonstrate how to use only one unitary reversal operation to restore an arbitrary state with phase damping noise. In principle, the initial state can always be recovered with a success probability of 1. Interestingly, we found that non-RU decomposition can also be used to restore some particular entangled states. This may open a new path to restore a quantum state beyond the standard RU scheme.

© 2013 Optical Society of America

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