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题名: Dynamics of quantum zeno and anti-zeno effects in an open system
作者: Zhang, P ;  Ai, Q ;  Li, Y ;  Xu, DZ ;  Sun, CP
刊名: SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
出版日期: 2014
卷号: 57, 期号:2, 页码:194-207
关键词: PROJECTION POSTULATE ;  PARADOX ;  COLLAPSE ;  DECAY ;  ATOM
学科分类: Physics
DOI: 10.1007/s11433-013-5377-x
通讯作者: Sun, CP (reprint author), Beijing Computat Sci Res Ctr, Beijing 100084, Peoples R China.
部门归属: [Zhang Peng] Renmin Univ China, Dept Phys, Beijing 100190, Peoples R China; [Ai Qing] Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan; [Ai Qing] Natl Taiwan Univ, Ctr Quantum Sci & Engn, Taipei 106, Taiwan; [Li Yong; Sun ChangPu] Beijing Computat Sci Res Ctr, Beijing 100084, Peoples R China; [Xu DaZhi; Sun ChangPu] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, 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.
资助者: National Natural Science Foundation of China [11074305, 10935010, 11074261, 11121403]; National Basic Research Program of China [2012CB922104, 2014CB921402]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000329997700002
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15489
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Recommended Citation:
Zhang, P,Ai, Q,Li, Y,et al. Dynamics of quantum zeno and anti-zeno effects in an open system[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2014,57(2):194-207.
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