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

Content Provider	Springer Nature Link
Author	Zhang, Peng Ai, Qing Li, Yong Xu, DaZhi Sun, ChangPu
Copyright Year	2014
Abstract	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.
Starting Page	194
Ending Page	207
Page Count	14
File Format	PDF
ISSN	16747348
Journal	Science in China Series G
Volume Number	57
Issue Number	2
e-ISSN	18691927
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-01-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	quantum Zeno effect quantum anti-Zeno effect quantum measurement Physics Classical Continuum Physics Astronomy, Observations and Techniques
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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