Dynamics of quantum zeno and anti-zeno effects in an open system

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	Dynamics of quantum zeno and anti-zeno effects in an open system
	Sun, CP
刊名	SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
	2014
卷号	57 期号:2 页码:194-207
关键词	PROJECTION POSTULATE PARADOX COLLAPSE DECAY ATOM
ISSN号	1674-7348
通讯作者	Sun, CP (reprint author), Beijing Computat Sci Res Ctr, Beijing 100084, Peoples R China.
英文摘要	We provide a general dynamical approach for the quantum Zeno and anti-Zeno effects in an open quantum system under repeated non-demolition measurements. In our approach the repeated measurements are described by a general dynamical model without the wave function collapse postulation. Based on that model, we further study both the short-time and long-time evolutions of the open quantum system under repeated non-demolition measurements, and derive the measurement-modified decay rates of the excited state. In the cases with frequent ideal measurements at zero-temperature, we re-obtain the same decay rate as that from the wave function collapse postulation (Nature, 2000, 405: 546). The correction to the ideal decay rate is also obtained under the non-ideal measurements. Especially, we find that the quantum Zeno and anti-Zeno effects are possibly enhanced by the non-ideal natures of measurements. For the open system under measurements with arbitrary period, we generally derive the rate equation for the long-time evolution for the cases with arbitrary temperature and noise spectrum, and show that in the long-time evolution the noise spectrum is effectively tuned by the repeated measurements. Our approach is also able to describe the quantum Zeno and anti-Zeno effects given by the phase modulation pulses, as well as the relevant quantum control schemes.
学科主题	Physics
收录类别	SCI
资助信息	National Natural Science Foundation of China [11074305, 10935010, 11074261, 11121403]; National Basic Research Program of China [2012CB922104, 2014CB921402]
原文出处	http://dx.doi.org/10.1007/s11433-013-5377-x
语种	英语
WOS记录号	WOS:000329997700002
公开日期	2014-04-25
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/15489]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	Sun, CP. Dynamics of quantum zeno and anti-zeno effects in an open system[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2014,57(2):194-207.
APA	Sun, CP.(2014).Dynamics of quantum zeno and anti-zeno effects in an open system.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,57(2),194-207.
MLA	Sun, CP."Dynamics of quantum zeno and anti-zeno effects in an open system".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 57.2(2014):194-207.