Quantum speed limit time of a two-level atom under different quantum feedback control

doi:10.1088/1674-1056/27/1/010303

Abstract

We investigate the quantum speed limit time (QSLT) of a two-level atom under quantum-jump-based feedback control or homodyne-based feedback control. Our results show that the two different feedback control schemes have different influences on the evolutionary speed. By adjusting the feedback parameters, the quantum-jump-based feedback control can induce speedup of the atomic evolution from an excited state, but the homodyne-based feedback control cannot change the evolutionary speed. Additionally, the QSLT for the whole dynamical process is explored. Under the quantum-jump-based feedback control, the QSLT displays oscillatory behaviors, which implies multiple speed-up and speed-down processes during the evolution. While, the homodyne-based feedback control can accelerate the speed-up process and improve the uniform speed in the uniform evolution process.

Keywords: quantum speed limit time quantum feedback control speedup

Received: 16 August 2017
Revised: 27 September 2017
Accepted manuscript online:

PACS:	03.65.Yz	(Decoherence; open systems; quantum statistical methods)
	03.67.Lx	(Quantum computation architectures and implementations)
	42.50.-p	(Quantum optics)

Fund:

Project supported by the National Natural Science Foundation of China (Grant No. 11374096), Hunan Provincial Innovation Foundation for Postgraduate, China (Grant No. CX2017B177), and the Scientific Research Project of Hunan Provincial Education Department, China (Grant No. 16C0949).

Corresponding Authors: Mao-Fa Fang
E-mail: mffang@hunnu.edu.cn

Cite this article:

Min Yu(余敏), Mao-Fa Fang(方卯发), Hong-Mei Zou(邹红梅) Quantum speed limit time of a two-level atom under different quantum feedback control 2018 Chin. Phys. B 27 010303

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Quantum speed limit time of a two-level atom under different quantum feedback control

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