From Zeno to anti-Zeno regime: Decoherence-control dependence on the quantum statistics of the bath

Rao, D. D. Bhaktavatsala; Kurizki, Gershon

doi:10.1103/physreva.83.032105

Cited by 31 publications

(42 citation statements)

References 37 publications

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“…Although theoretical and experimental studies done in this field have intensified over recent years, the results are still far from satisfactory. A variety of theoretical proposals for combating the deleterious environmental noise have been proposed [1][2][3][4][5][6][7][8][9]. Among them, dynamical decoupling or dynamical control, developed from the Bang-Bang method, of system-environment interactions by external fields is widely discussed due to its simplicity and accessibility to theoretical and experimental investigations [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Nonperturbative quantum dynamical decoupling

Jing

You

et al. 2013

Phys. Rev. A

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Current dynamical control based on the bang-bang control mechanism involving various types of pulse sequences is essentially a perturbative theory. This paper presents a nonperturbative dynamical control approach based on the exact stochastic Schrödinger equation. We report our findings on the pulse parameter regions in which the effective dynamical control can be exercised. The onset of the effective control zones reflects the nonperturbative feature of our approach. The nonperturbative methods offer possible new implementations when several different parameter regions are available.

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Section: Introductionmentioning

confidence: 99%

Nonperturbative quantum dynamical decoupling

Jing

You

et al. 2013

Phys. Rev. A

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“…into useful work [coherent signal (piston) amplification] via rapid modulations of thermalized quantum systems The present engine model, in which the system is always coupled to a single bath and yet may perform useful work, is potentially important for systems totally embedded in a single bath, such as a cavity, so that conventional heat-engine (two-bath) thermodynamic cycles may be impossible to implement. Further investigation may include brief disturbances other than measurements, e.g., phase flips of a TLS in a bath [34]. This research was supported by DIP, ISF, BSF and CONACYT.…”

Section: Discussionmentioning

confidence: 99%

Work extraction via quantum nondemolition measurements of qubits in cavities: Non-Markovian effects

et al. 2013

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We show that frequent nondemolition measurements of a quantum system immersed in a thermal bath allow the extraction of work in a closed cycle from the system-bath interaction (correlation) energy, a hitherto unexploited work resource. It allows for work even if no information is gathered or the bath is at zero temperature, provided the cycle is within the bath memory time. The predicted work resource may be the basis of quantum engines embedded in a bath with long memory time, such as the electromagnetic bath of a high-Q cavity coupled to two-level systems. I. IntroductionInformation acquired by an observer on the system can be commuted into work in a single-bath engine [1][2][3][4][5][6][7][8][9]. To this end, the observer ("Maxwell's demon") must manipulate the system according to the results of measurements performed on it. The measurements have therefore to be selective, i.e., their outcomes must be read and discriminated to determine the observer's course of action [7,10]. The balance of work and information is embodied by the Szilard-Landauer (SL) principle [1, 2] whereby work obtainable from a measurement must not exceed the energy cost of erasing its record from the observer's memory. Notwithstanding ongoing efforts to expand information-based thermodynamics (IT) so as to include measurement-cost effects [10][11][12] beyond the original SL balance (see Appendix), an important aspect has been little addressed thus far [13]: How essential is the thermodynamic paradigm of system-bath separability [14,15] to the analysis of work extraction by measurements?This question is here investigated in the context of non-Markovian quantum thermodynamics "under observation" [16][17][18][19][20][21]. Namely, we show that frequent measurements can induce changes in system-bath correlations, unaccounted for by the separability paradigm, and thereby change the tradeoff of information and work. Consequently, selective (read) measurements can extract more work in a closed cycle than what the SL principle allows. This effect requires the cycle to be completed within a non-Markovian (bath-memory) time-scale.We further show that non-selective quantum nondemolition (QND) measurements of the system energy (which we shall also denote as unread measurements, i.e., measurements whose outcomes do not matter) enable the system to do work in a cycle, although they provide no information on the system, nor do they change its state (by their definition as QND measurements) and thus do not act as a "demon." Work is shown to be obtainable within the bath memory time even at zero temperature (T = 0),

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“…The QZE and AZE correspond to the suppression and enhancement, respectively, of the bath effects via control. Dynamical control methods based on the QZE are aimed at protecting the quantumness (coherence or entanglement) of the probe [45,63,64], but also at diagnosing the bath spectra [9,15,65] and transferring QI via noisy media [43,[66][67][68][69]. By contrast, AZE-based control is useful for fast, versatile and robust cooling of thermalized quantum systems [51][52][53]70,71].…”

Section: Bath-optimized Task-oriented Control (Botoc)mentioning

confidence: 99%

“…This requires an interplay of QZE and AZE that may depend on the quantum statistics of the bath [65].…”

Section: Of 21mentioning

confidence: 99%

Quantum Sensing of Noisy and Complex Systems under Dynamical Control

2016

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Abstract:We review our unified optimized approach to the dynamical control of quantum-probe interactions with noisy and complex systems viewed as thermal baths. We show that this control, in conjunction with tools of quantum estimation theory, may be used for inferring the spectral and spatial characteristics of such baths with high precision. This approach constitutes a new avenue in quantum sensing, dubbed quantum noise spectroscopy.

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From Zeno to anti-Zeno regime: Decoherence-control dependence on the quantum statistics of the bath

Cited by 31 publications

References 37 publications

Nonperturbative quantum dynamical decoupling

Nonperturbative quantum dynamical decoupling

Work extraction via quantum nondemolition measurements of qubits in cavities: Non-Markovian effects

Quantum Sensing of Noisy and Complex Systems under Dynamical Control

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