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Enhanced Superdense Coding over Correlated Amplitude Damping Channel

1
School of Information Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
2
College of Physics and Electronic Information, Gannan Normal University, Ganzhou 341000, China
*
Author to whom correspondence should be addressed.
Entropy 2019, 21(6), 598; https://doi.org/10.3390/e21060598
Received: 30 April 2019 / Revised: 9 June 2019 / Accepted: 13 June 2019 / Published: 16 June 2019
(This article belongs to the Special Issue Open Quantum Systems (OQS) for Quantum Technologies)
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Abstract

Quantum channels with correlated effects are realistic scenarios for the study of noisy quantum communication when the channels are consecutively used. In this paper, superdense coding is reexamined under a correlated amplitude damping (CAD) channel. Two techniques named as weak measurement and environment-assisted measurement are utilized to enhance the capacity of superdense coding. The results show that both of them enable us to battle against the CAD decoherence and improve the capacity with a certain probability. Remarkably, the scheme of environment-assisted measurement always outperforms the scheme of weak measurement in both improving the capacity and successful probability. These notable superiorities could be attributed to the fact that environment-assisted measurement can extract additional information from the environment and thus it performs much better. View Full-Text
Keywords: superdense coding; correlated amplitude damping channel; weak measurement; environment-assisted measurement superdense coding; correlated amplitude damping channel; weak measurement; environment-assisted measurement
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Li, Y.-L.; Wei, D.-M.; Zu, C.-J.; Xiao, X. Enhanced Superdense Coding over Correlated Amplitude Damping Channel. Entropy 2019, 21, 598.

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