Collective operations can extremely reduce work fluctuations

Perarnau-Llobet, Martí; Uzdin, Raam

doi:10.1088/1367-2630/ab36a9

Cited by 31 publications

(20 citation statements)

References 67 publications

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“…This indicates that common noise may be also considered for enhancing the performance of small autonomous classical motors, like thermoelectric devices [73] or biomolecular systems [74] described within the framework of stochastic thermodynamics [75]. Nevertheless we notice that although the magnitude of the quantum coherent enhancements compared with their incoherent counterpart is rather modest in this fridge model, we expect that the same mechanism might be enforced in many-body configurations [76][77][78] where this effect may be greatly amplified.…”

Section: Discussionmentioning

confidence: 88%

Boosting the performance of small autonomous refrigerators via common environmental effects

et al. 2019

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We explore the possibility of enhancing the performance of small thermal machines by the presence of common noise sources. In particular, we study a prototypical model for an autonomous quantum refrigerator comprised by three qubits coupled to thermal reservoirs at different temperatures. Our results show that engineering the coupling to the reservoirs to act as common environments lead to relevant improvements in the performance. The enhancements arrive to almost double the cooling power of the original fridge without compromising its efficiency. The greater enhancements are obtained when the refrigerator may benefit from the presence of a decoherence-free subspace. The influence of coherent effects in the dissipation due to one-and two-spin correlated processes is also examined by comparison with an equivalent incoherent yet correlated model of dissipation.

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Section: Discussionmentioning

confidence: 88%

Boosting the performance of small autonomous refrigerators via common environmental effects

et al. 2019

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“…Theoretical studies have shown advantages by exploiting collective effects in quantum batteries [23,32,36,41,69,83]. Here, we apply the bounds on work extraction to a simple many-body spin system described by the XY model [18,39,73], which can be investigated experimentally [59,104].…”

Section: The Anisotropic Xy Modelmentioning

confidence: 99%

Energy storage and coherence in closed and open quantum batteries

Caravelli

Yan

García-Pintos

et al. 2021

Quantum

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We study the role of coherence in closed and open quantum batteries. We obtain upper bounds to the work performed or energy exchanged by both closed and open quantum batteries in terms of coherence. Specifically, we show that the energy storage can be bounded by the Hilbert-Schmidt coherence of the density matrix in the spectral basis of the unitary operator that encodes the evolution of the battery. We also show that an analogous bound can be obtained in terms of the battery's Hamiltonian coherence in the basis of the unitary operator by evaluating their commutator. We apply these bounds to a 4-state quantum system and the anisotropic XY Ising model in the closed system case, and the Spin-Boson model in the open case.

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“…For η = 0, the Hamiltonian (23) reduces to the Dicke model. At the critical point g = √ ω a ω c /2, the system undergoes a well-known normal-superradiant phase transition 80 .…”

Section: A Charging Properties With Interatomic Interactionsmentioning

confidence: 99%

“…Previous work have shown the importance of quantum resources in improving the performances of QBs, such as work extraction [12][13][14][15] , charging power [16][17][18][19] , and energy fluctuation [20][21][22][23][24][25] . In 2013 Alicki and Fannes first proposed that entangling unitary controls acting globally extract in general more work than unitary operations acting on each quantum cell separately 5 .…”

Section: Introductionmentioning

confidence: 99%

Extended Dicke quantum battery with interatomic interactions and driving field

Dou,

Lu,

Wang

et al. 2021

Preprint

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We investigate the charging process of quantum battery (QB) systems in an extended Dicke model with both atomic interactions and an external driving field. We focus on the effects of the atomic interaction and the external driving field on the charging performance of QB and find that the maximum stored energy of QB has a critical phenomenon. We analyze the critical behavior and obtain the analytical expression of the critical atomic interaction. The dependence of the maximum stored energy, the energy quantum fluctuations and the maximum charging power on the number N of the two-level systems are also discussed. In particular, for the maximum charging power, we obtain the quantum advantage of the QB, which approximately satisfies a superlinear scaling relation Pmax ∝ N α , where scaling exponent α varies with the number N of the two-level systems. In the ultra-strong coupling regime, the atomic interaction can lead to a faster battery charging, and the quantum advantage α = 1.88 can be achieved. While in the deep-strong coupling regime, the quantum advantage of the QB's maximum charging power is the same as that of the Dicke QB, i.e., α = 1.5.

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Collective operations can extremely reduce work fluctuations

Cited by 31 publications

References 67 publications

Boosting the performance of small autonomous refrigerators via common environmental effects

Boosting the performance of small autonomous refrigerators via common environmental effects

Energy storage and coherence in closed and open quantum batteries

Extended Dicke quantum battery with interatomic interactions and driving field

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