Quantum master equations for entangled qubit environments

Daryanoosh, Shakib; Baragiola, Ben Q.; Guff, Thomas; Gilchrist, Alexei

doi:10.1103/physreva.98.062104

Cited by 25 publications

(66 citation statements)

References 90 publications

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“…It would be interesting to further investigate the role of multipartite entanglement on thermalization via multi-qubit collistions in the spirit of Refs. [22,33].…”

Section: Discussionmentioning

confidence: 99%

“…The only ineffective coherences that appear in a HEC block correspond to the anti-diagonal of ρ b . These ineffective coherences also do not contribute to the generation of multi-partite correlations in a scenario where multi-qubit clusters repeatedly interact with independent qubits [33]. Figure 2.…”

Section: Effects Of Bath Coherences On the Target-qubit Evolutionmentioning

confidence: 99%

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Collectively enhanced thermalization via multiqubit collisions

et al. 2019

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We investigate the evolution of a target qubit caused by its multiple random collisions with N -qubit clusters. Depending on the cluster state, the evolution of the target qubit may correspond to its effective interaction with a thermal bath, a coherent (laser) drive, or a squeezed bath. In cases where the target qubit relaxes to a thermal state its dynamics can exhibit a quantum advantage, whereby the target-qubit temperature can be scaled up proportionally to N 2 and the thermalization time can be shortened by a similar factor, provided the appropriate coherence in the cluster is prepared by non-thermal means. We dub these effects quantum super-thermalization due to its analogies to super-radiance. Experimental realizations of these effects are suggested.

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“…It would be interesting to further investigate the role of multipartite entanglement on thermalization via multi-qubit collistions in the spirit of Refs. [22,33].…”

Section: Discussionmentioning

confidence: 99%

Section: Effects Of Bath Coherences On the Target-qubit Evolutionmentioning

confidence: 99%

Collectively enhanced thermalization via multiqubit collisions

et al. 2019

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“…As we will show, under the assumption of continuous evolution in the limit of collisions lasting an infinitesimal amount of time, the system's evolution can be cast in the form of a Markovian Lindblad master equation with collective jump operators acting nontrivially on both systems (see also Ref. [60]).…”

Section: Introductionmentioning

confidence: 99%

Quantum machines powered by correlated baths

Chiara

Antezza

2020

Phys. Rev. Research

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We consider thermal machines powered by locally equilibrium reservoirs that share classical or quantum correlations. The reservoirs are modeled by the so-called collisional model or repeated interactions model. In our framework, two reservoir particles, initially prepared in a thermal state, are correlated through a unitary transformation and afterward interact locally with the two quantum subsystems which form the working fluid. For a particular class of unitaries, we show how the transformation applied to the reservoir particles affects the amount of heat transferred and the work produced. We then compute the distribution of heat and work when the unitary is chosen randomly, proving that the total swap transformation is the optimal one. Finally, we analyze the performance of the machines in terms of classical and quantum correlations established among the microscopic constituents of the machine.

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“…Eq. (A5) is quite general and it is applicable to several micromaser based models [8,14,15] including superradiant systems [10] and entangled qubit environments [71]. Also it works for the case of generalized quantum "phaseonium fuels" [11], where the bath system consists of a N + 1 level atom with N degenerate coherent ground states [72].…”

Section: Appendix A: Generalized Micromaser Like Equationmentioning

confidence: 99%

Spectral signatures of non-thermal baths in quantum thermalization

Román-Ancheyta

Çakmak

Müstecaplıoğlu

2019

Quantum Sci. Technol.

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We show that certain coherences, termed as heat-exchange coherences, which contribute to the thermalization process of a quantum probe in a repeated interactions scheme, can modify the spectral response of the probe system. We suggest to use the power spectrum as a way to experimentally assess the apparent temperature of non-thermal atomic clusters carrying such coherences and also prove that it is useful to measure the corresponding thermalization time of the probe, assuming some information is provided on the nature of the bath. We explore this idea in two examples in which the probe is assumed to be a single-qubit and a single-cavity field mode. Moreover, for the single-qubit case, we show how it is possible to perform a quantum simulation of resonance fluorescence using such repeated interactions scheme with clusters carrying different class of coherences.

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Quantum master equations for entangled qubit environments

Cited by 25 publications

References 90 publications

Collectively enhanced thermalization via multiqubit collisions

Collectively enhanced thermalization via multiqubit collisions

Quantum machines powered by correlated baths

Spectral signatures of non-thermal baths in quantum thermalization

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