Quantum speed limit in a qubit-spin-bath system

被引：15
|
作者：
Hou, Lu [1 ]
Shao, Bin [1 ]
Wei, Yong-Bo [1 ]
Zou, Jian [1 ]
机构：
[1] Beijing Inst Technol, Sch Phys, Beijing 100081, Peoples R China
来源：
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL | 2015年 / 48卷 / 49期
基金：
中国国家自然科学基金;
关键词：
quantum speed limit; non-Markovian system; external control; upper state population; EVOLUTION; DYNAMICS; TIME;
D O I：
10.1088/1751-8113/48/49/495302
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We investigate the behavior of quantum speed limit (QSL) time for a typical non-Markovian system, a central spin coupled to a spin star configuration. We connect the QSL time with an external control and show that the effectiveness of the external magnetic field, as well as the coupling strength, is related to the fundamental bounds that affect the maximum speed at which a quantum system can evolve in its state space. We also demonstrate that a spin bath with larger size may shorten the QSL time, while the upper state population plays an important role for the acceleration of quantum evolution in the memory surrounding.
引用
收藏
页数：10
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