Controlling of entropic uncertainty in open quantum system via proper placement of quantum register

doi:10.1088/1674-1056/27/10/100302

Abstract

We investigate the dynamical behaviors of quantum-memory-assisted entropic uncertainty and its lower bound in the amplitude-damping channel. The influences of different placement positions of the quantum register on the dynamics of quantum coherence, quantum entanglement, and quantum discord are analyzed in detail. The numerical simulation results show that the quantum register should be placed in the channel of the non-Markovian effect. This option is beneficial to reduce the entropic uncertainty and its lower bound. We also find that this choice does not change the evolution of the quantum coherence and quantum entanglement, but changes the dynamical process of the quantum discord of the system. These results show that quantum coherence, quantum entanglement, and quantum discord are different quantum resources with unique characteristics and properties, and quantum discord can play a key role in reducing the uncertainty of quantum systems.

Keywords: quantum-memory-assisted entropic uncertainties quantum register open quantum system

Received: 28 May 2018
Revised: 19 July 2018
Accepted manuscript online:

PACS:	03.65.Ta	(Foundations of quantum mechanics; measurement theory)
	05.40.Ca	(Noise)
	03.65.Yz	(Decoherence; open systems; quantum statistical methods)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 11264015 and 11404150).

Corresponding Authors: Ju-Ju Hu
E-mail: jyh2006@jxnu.edu.cn

Cite this article:

Ying-Hua Ji(嵇英华), Qiang Ke(柯强), Ju-Ju Hu(胡菊菊) Controlling of entropic uncertainty in open quantum system via proper placement of quantum register 2018 Chin. Phys. B 27 100302

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Controlling of entropic uncertainty in open quantum system via proper placement of quantum register

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