Issue |
EPL
Volume 118, Number 3, May 2017
|
|
---|---|---|
Article Number | 30002 | |
Number of page(s) | 7 | |
Section | General | |
DOI | https://doi.org/10.1209/0295-5075/118/30002 | |
Published online | 05 July 2017 |
Protecting quantum coherence and discord from decoherence of depolarizing noise via weak measurement and measurement reversal
1 School of Physics, Huazhong University of Science and Technology - Wuhan 430074, China
2 Quantum Optics Lab., Department of Physics, COMSATS Institute of Information Technology - Islamabad, Pakistan
Received: 17 March 2017
Accepted: 14 June 2017
Protection of the quantum coherence and discord in realistic quantum systems interacting with the environment of depolarizing noise is an important subject in quantum information processing. Weak measurement and measurement reversal can effectively suppress the amplitude damping-class decoherence. In this paper, we examine the effect of this protocol in the protection of quantum coherence and discord subjected to depolarizing noise environments. Our scheme consists of a prior weak measurement on each qubit before interacting with noisy channels followed by post measurement reversal. It is found that quantum coherence and discord can be enhanced to an optimal value by performing weak measurements and adjusting measurement parameters on each qubit. In addition, the maximal value of the quantum coherence and discord is found to be independent of the initial-state parameters.
PACS: 03.65.Yz – Decoherence; open systems; quantum statistical methods / 03.67.-a – Quantum information / 03.65.-w – Quantum mechanics
© EPLA, 2017
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.