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arXiv:1712.09769 · Science China Physics Mechanics and Astronomy

Coherence evolution in two-qubit system going through amplitude damping channel

Ming‐Jing Zhao, Teng Ma, Yu-Quan Ma

Published Oct 30, 2017• 25 citations
arXivHTMLPDF
DOI
10.1007/s11433-017-9095-7

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The maximal evolution speed of a quantum system can be represented by quantum speed limit time (QSLT). We investigate the QSLT of a two-qubit system passing through a correlated channel (amplitude damping, phase damping, and depolarizing). By adjusting the correlation parameter of the channel and the initial entanglement, a method to accelerate the evolution speed of the system for some specific channels is proposed. It is shown that, in the amplitude damping channel and the depolarizing channel, QSLT may be shortened in some cases by increasing the correlation parameter of the channel and the initial entanglement, which are in sharp contrast to the phase damping channel. In particular, under depolarizing channels, the transition from no-speedup evolution to speedup evolution for the system can be realized by changing the correlation strength of the channel.