Gaussian ancillary bombardment

Grimmer, Daniel; Brown, Eric G.; Kempf, Achim; Mann, Robert B.; Martín-Martínez, Eduardo

doi:10.1103/physreva.97.052120

Cited by 9 publications

(19 citation statements)

References 22 publications

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“…At the more frequent values τ = 4πn/ g 2 x + 16ω 2 s , the counter-rotating contributions cancel and the system equilibrates to a Gibbs state. Let us add here that the steady-state work power (8) has an interesting behavior: besides vanishing at the thermal operation points as expected, it is suppressed in the vicinity of inversion points and is exactly zero at those points (Fig. 4).…”

Section: A Qubit System and Resonant Probe Qubitssupporting

confidence: 72%

“…For g x = g y = g and ω s = ω p , the system-probe interaction describes a resonant exchange of excitation that preserves the total energy. In other words, the resonant probes realize a channel of thermal operations that effectively models spin thermalization, as often noticed and exploited [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. This holds true for arbitrary system spin numbers J, see App.…”

Section: Study Of Gy = ±Gxmentioning

confidence: 97%

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Nonequilibrium dynamics with finite-time repeated interactions

2019

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We study quantum dynamics in the framework of repeated interactions between a system and a stream of identical probes. We present a coarse-grained master equation that captures the system's dynamics in the natural regime where interactions with different probes do not overlap, but is otherwise valid for arbitrary values of the interaction strength and mean interaction time. We then apply it to some specific examples. For probes prepared in Gibbs states, such channels have been used to describe thermalisation: while this is the case for many choices of parameters, for others one finds out-of-equilibrium states including inverted Gibbs and maximally mixed states. Gapless probes can be interpreted as performing an indirect measurement, and we study the energy transfer associated with this measurement. arXiv:1809.04781v2 [quant-ph]

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Section: A Qubit System and Resonant Probe Qubitssupporting

confidence: 72%

Section: Study Of Gy = ±Gxmentioning

confidence: 97%

Nonequilibrium dynamics with finite-time repeated interactions

2019

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“…It is also possible to show that these states have the same populations level by level, as already predicted for harmonic oscillators in Ref. [48].…”

Section: Appendix B: Functioning Regimes and Efficiency Of The Cycle With Mediatorsupporting

confidence: 79%

Power maximization of two-stroke quantum thermal machines

2021

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We present a detailed study of quantum thermal machines employing quantum systems as working substances. In particular, we study two different types of two-stroke cycles where two collections of identical quantum systems with evenly spaced energy levels are initially prepared at thermal equilibrium by putting them in contact with a cold and a hot thermal bath, respectively. The two cycles differ in the absence or the presence of a mediator system, while, in both cases, non-resonant exchange Hamiltonians are exploited as particle interactions. We show that the efficiencies of these machines depend only on the energy gaps of the systems composing the collections and are equal to the efficiency of "equivalent" Otto cycles. Focusing on the cases of qubits or harmonic oscillators for both models, we maximize the engine power and analyze, in the model without the mediator, the role of the waiting time between subsequent interactions. It turns out that the case with the mediator can bring performance advantages when the interaction times are comparable with the waiting time of the correspondent cycle without the mediator. We find that in both cycles, the power peaks of qubit systems can surpass the Curzon-Ahlborn efficiency. Finally, we compare our cycle without the mediator with previous schemes of the quantum Otto cycle showing that high coupling is not required to achieve the same maximum power.

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“…Using recent results on Gaussian ICM [43,62] we can efficiently calculate the fixed points and convergence rates of repeated application of Φ S cell . This is achieved by straightforward application of the formalism developed in [62]. For the convenience of the reader, we provide a quick summary particularized to our setup in Appendix B.…”

Section: Non-perturbative Time-evolutionmentioning

confidence: 99%

“…This section will briefly review those well-known techniques and show how they are applied to our setup. More details on GQM and Gaussian ICM can be found in [58][59][60][61] and [43,62], respectively.…”

Section: Appendix B Gaussian Interpolated Collision Model Formalismmentioning

confidence: 99%

The Unruh Effect in Slow Motion

2021

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We show under what conditions an accelerated detector (e.g., an atom/ion/molecule) thermalizes while interacting with the vacuum state of a quantum field in a setup where the detector’s acceleration alternates sign across multiple optical cavities. We show (non-perturbatively) in what regimes the probe `forgets’ that it is traversing cavities and thermalizes to a temperature proportional to its acceleration, the same as it would in free space. Then we analyze in detail how this thermalization relates to the renowned Unruh effect. Finally, we use these results to propose an experimental testbed for the direct detection of the Unruh effect at relatively low probe speeds and accelerations, potentially orders of magnitude below previous proposals.

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Gaussian ancillary bombardment

Cited by 9 publications

References 22 publications

Nonequilibrium dynamics with finite-time repeated interactions

Nonequilibrium dynamics with finite-time repeated interactions

Power maximization of two-stroke quantum thermal machines

The Unruh Effect in Slow Motion

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