Nonlocal advantage of quantum coherence in a dephasing channel with memory

doi:10.1088/1674-1056/abcf4a

Abstract We investigate nonlocal advantage of quantum coherence (NAQC) in a correlated dephasing channel modeled by the multimode bosonic reservoir. We obtain analytically the dephasing and memory factors of this channel for the reservoir having a Lorentzian spectral density, and analyze how they affect the NAQC defined by the l₁ norm and relative entropy. It is shown that the memory effects of this channel on NAQC are state-dependent, and they suppress noticeably the rapid decay of NAQC for the family of input Bell-like states with one excitation. For the given transmission time of each qubit, we also obtain the regions of the dephasing and memory factors during which there is NAQC in the output states.

Keywords: quantum coherence correlated quantum channel memory effects

Received: 10 September 2020
Revised: 02 October 2020
Accepted manuscript online: 01 December 2020

PACS:	03.67.Mn	(Entanglement measures, witnesses, and other characterizations)
	03.65.Ta	(Foundations of quantum mechanics; measurement theory)
	03.65.Yz	(Decoherence; open systems; quantum statistical methods)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11675129, 11774406, and 11934018), the National Key R&D Program of China (Grant Nos. 2016YFA0302104 and 2016YFA0300600), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB28000000), and the Research Program of Beijing Academy of Quantum Information Sciences (Grant No. Y18G07).

Corresponding Authors: ^†Corresponding author. E-mail: mingliang0301@163.com ^‡Corresponding author. E-mail: hfan@iphy.ac.cn

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Ming-Liang Hu(胡明亮), Yu-Han Zhang(张宇晗), and Heng Fan(范桁) Nonlocal advantage of quantum coherence in a dephasing channel with memory 2021 Chin. Phys. B 30 030308

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