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

被引：0

作者：

余敏 ^{[1
]}

方卯发 ^{[1
]}

邹红梅 ^{[1
]}

机构：

[1] Department of Physics, Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education,and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University

来源：

Chinese Physics B | 2018年 / 27卷 / 01期

基金：

中国国家自然科学基金;

关键词：

quantum speed limit time; quantum feedback control; speedup;

D O I：

暂无

中图分类号：

O413 [量子论];

学科分类号：

070201 ;

摘要：

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.

引用

页码：257 / 261

页数：5