Stable and charge-switchable quantum batteries

Santos, Alan C.; Saguia, A.; Sarandy, M. S.

doi:10.1103/physreve.101.062114

Cited by 91 publications

(83 citation statements)

References 48 publications

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“…We also demonstrate how dissipation plays a crucial role; in a closed system, the coherent effects that lead to fast charging can also lead to subsequent fast discharging. Hence, stabilization of stored energy remains an open question: Proposed stabilization methods include continuous measurements ( 25 ), dark states ( 21 ), and novel energy trapping mechanisms ( 26 , 27 ). In our open noisy system, dephasing causes transitions between the optically active bright mode and inactive dark modes.…”

Section: Introductionmentioning

confidence: 99%

Superabsorption in an organic microcavity: Toward a quantum battery

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Superabsorption in an organic microcavity: Toward a quantum battery

et al. 2022

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“…Recent proposals have shown how to mitigate the effect of environmental noise via measurements [37] or dark states [38,39], while other authors have instead suggested to harness noise as a charging mechanism [40][41][42][43][44][45]. These approaches are notable due to their stability, meaning that the battery's charge tends to a stationary value instead of oscillating over time [38,46]. This desirable feature mimics the behaviour of battery charging in everyday life and removes the need for precisely timed switching of the battery-charger coupling.…”

Section: Introductionmentioning

confidence: 99%

Charging a quantum battery with linear feedback control

Mitchison

Goold

Prior

2021

Quantum

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Energy storage is a basic physical process with many applications. When considering this task at the quantum scale, it becomes important to optimise the non-equilibrium dynamics of energy transfer to the storage device or battery. Here, we tackle this problem using the methods of quantum feedback control. Specifically, we study the deposition of energy into a quantum battery via an auxiliary charger. The latter is a driven-dissipative two-level system subjected to a homodyne measurement whose output signal is fed back linearly into the driving field amplitude. We explore two different control strategies, aiming to stabilise either populations or quantum coherences in the state of the charger. In both cases, linear feedback is shown to counteract the randomising influence of environmental noise and allow for stable and effective battery charging. We analyse the effect of realistic control imprecisions, demonstrating that this good performance survives inefficient measurements and small feedback delays. Our results highlight the potential of continuous feedback for the control of energetic quantities in the quantum regime.

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“…The self-contained thermal devices were originally proposed as refrigerators to cool the cold bath [ 12 , 13 , 14 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 ], or as thermal engines to extract work [ 46 , 47 ]. Later, they were widely extended to a variety of cases, including the different interaction mechanisms, or for achieving various functions, such as heat current amplification [ 9 , 24 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ], thermal rectification [ 19 , 20 , 21 , 54 , 55 , 56 , 57 , 58 , 59 , 60 ], thermal batteries [ 61 , 62 , 63 ], and thermometers [ 64 , 65 , 66 ]. It is a quite fundamental question for quantum thermodynamics as to...…”

Section: Introductionmentioning

confidence: 99%

Common Environmental Effects on Quantum Thermal Transistor

Liu

2021

Entropy

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Quantum thermal transistor is a microscopic thermodynamical device that can modulate and amplify heat current through two terminals by the weak heat current at the third terminal. Here we study the common environmental effects on a quantum thermal transistor made up of three strong-coupling qubits. It is shown that the functions of the thermal transistor can be maintained and the amplification rate can be modestly enhanced by the skillfully designed common environments. In particular, the presence of a dark state in the case of the completely correlated transitions can provide an additional external channel to control the heat currents without any disturbance of the amplification rate. These results show that common environmental effects can offer new insights into improving the performance of quantum thermal devices.

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Stable and charge-switchable quantum batteries

Cited by 91 publications

References 48 publications

Superabsorption in an organic microcavity: Toward a quantum battery

Superabsorption in an organic microcavity: Toward a quantum battery

Charging a quantum battery with linear feedback control

Common Environmental Effects on Quantum Thermal Transistor

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