Quantum anti-Zeno effect without rotating wave approximation

Ai, Qing; Li, Yong; Zheng, Hang; Sun, C. P.

doi:10.1103/physreva.81.042116

Cited by 107 publications

(103 citation statements)

References 24 publications

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“…In fact, the effect of the counter-rotating terms on Quantum Zeno and anti-Zeno effects have been discussed in details in the past few years; see e.g. refs 21,39. It turns out that the RWA description remains approximately valid provided that the coupling with the environment is weak enough and that the state to preserve is the bare excited state of the atomic system, see ref.…”

Section: Model and Dynamicsmentioning

confidence: 99%

“…Other studies in the past have discussed modifications of the Quantum Zeno effect in the case of non-Markovian behaviors, see e.g. refs 10,17,21, 22, 23. Here, however, we are interested not only in the Zeno-like physics in presence of memory effects, but also (and more prominently) in the modifications of the non-Markovian character of the dynamics induced by the Zeno-type mechanism; and, to this end, at variance with previous works, we will evaluate non-Markovianity in a quantitative way.…”

mentioning

confidence: 99%

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Quantum Zeno-type effect and non-Markovianity in a three-level system

Karlsson

Francica

Piilo

et al. 2016

Sci Rep

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We study the coexistence of the quantum Zeno-type effect and non-Markovianity for a system decaying in a structured bosonic environment and subject to a control field. The interaction with the environment induces decay from the excited to the ground level, which, in turn, is coherently coupled to another meta-stable state. The control of the strength of the coherent coupling between the stable levels allows the engineering of both the dissipation and of the memory effects, without modifying neither the system-reservoir interaction, nor environmental properties. We use this framework in two different parameter regimes corresponding to fast (bad cavity limit) and slow dissipation (good cavity limit) in the original and un-controlled qubit system. Our results show a non-monotonic behavior of memory effects when increasing the effectiveness of the Zeno-like freezing. Moreover, we identify a new source of memory effects which allows the persistence of non-Markovianity for long times while the excited state has already been depleted.

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Section: Model and Dynamicsmentioning

confidence: 99%

mentioning

confidence: 99%

Quantum Zeno-type effect and non-Markovianity in a three-level system

Karlsson

Francica

Piilo

et al. 2016

Sci Rep

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“…In our Hamiltonian H F , the rotating wave approximation is not used so that the possible effects given by the counter-rotating terms can be included [47,48]. In this paper we consider the evolution of such a dissipative TLS under repeated measurements.…”

Section: Repeated Measurements About Two Level Systemmentioning

confidence: 99%

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

Zhang

et al. 2014

Sci. China Phys. Mech. Astron.

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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 measurementmodified decay rates of the excited state. In the cases with frequent ideal measurements at zerotemperature, we re-obtain the same decay rate as that from the wave function collapse postulation (Nature 405, 546 (2000)). The correction to the ideal decay rate is also obtained under the nonideal 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.

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“…In such a regime, RWA is no longer valid and countering rotating terms can give rise to novel features such as quantum integrability [3], asymmetry of vacuum Rabi-splitting [4], non-classical photon statistics [5,6], superradiance transition [7], and the spontaneous release of virtual photons [8,9]. In addition, counter-rotating terms can modify the collapse and revival dynamics [10], and quantum Zeno and anti-Zeno effects [11,12].…”

Section: Introductionmentioning

confidence: 99%

Phase-kicked control of counter-rotating interactions in the quantum Rabi model

Huang

Law

2015

Phys. Rev. A

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We present an interaction scheme to control counter-rotating terms in the quantum Rabi model. We show that by applying a sequence of π/2 phase kicks to a two-level atom and a single mode quantized field, the natural dynamics of the Rabi model can be interrupted in a way that counterrotating transitions can be significantly enhanced. This is achieved by a suitable timing of the phase kicks determined by a phase matching condition. If the time between successive kicks is sufficiently short, our scheme is turned into a dynamical decoupling problem in which the effects of counter-rotating terms can be strongly suppressed under ultrastrong coupling.

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Quantum anti-Zeno effect without rotating wave approximation

Cited by 107 publications

References 24 publications

Quantum Zeno-type effect and non-Markovianity in a three-level system

Quantum Zeno-type effect and non-Markovianity in a three-level system

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

Phase-kicked control of counter-rotating interactions in the quantum Rabi model

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