Quantum speed-up capacity in different types of quantum channels for two-qubit open systems

Wu, Wei and Liu, Xin and Wang, Chao (2018) Quantum speed-up capacity in different types of quantum channels for two-qubit open systems. Chinese Physics B, 27 (6). 060302. ISSN 1674-1056. (doi:https://doi.org/10.1088/1674-1056/27/6/060302) (Access to this publication is currently restricted. You may be able to access a copy if URLs are provided)

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Abstract

A potential acceleration of a quantum open system is of fundamental interest in quantum computation, quantum communication, and quantum metrology. In this paper, we investigate the “quantum speed-up capacity” which reveals the potential ability of a quantum system to be accelerated. We explore the evolutions of the speed-up capacity in different quantum channels for two-qubit states. We find that although the dynamics of the capacity is varying in different kinds of channels, it is positive in most situations which are considered in the context except one case in the amplitude-damping channel. We give the reasons for the different features of the dynamics. Anyway, the speed-up capacity can be improved by the memory effect. We find two ways which may be used to control the capacity in an experiment:selecting an appropriate coefficient of an initial state or changing the memory degree of environments.

Item Type: Article
Uncontrolled keywords: quantum speed-up capacity, quantum speed limit, two-qubit open systems, quantum channel, memory effect
Divisions: Faculties > Sciences > School of Engineering and Digital Arts
Faculties > Sciences > School of Engineering and Digital Arts > Broadband & Wireless Communications
Depositing User: Chao Wang
Date Deposited: 14 Jun 2018 10:02 UTC
Last Modified: 15 Jun 2018 11:31 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/67305 (The current URI for this page, for reference purposes)
Wang, Chao: https://orcid.org/0000-0002-0454-8079
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