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Physical Review A

Two-mode Raman quantum battery dependent on coupling strength

Lu Wang, Shu-Qian Liu, Feng-Lin Wu, Hao Fan, S.Y. Liu

Published Dec 4, 2023• 25 citations
Publisher

Abstract

We investigate a series of two-mode quantum batteries (QBs) which exhibits better performance in both the stored energy and average charging power compared to the two-photon case. In both the model related to coupling strength and Raman cases, we find the QBs can store energy faster and have a higher efficiency than the original case. Among the derived models we have studied, the two-mode Raman QB dependent on coupling strength has the best performance. We also present the relationship between the ergotropy and battery-charger entanglement of incoherent QBs and define the resource utilization efficiency $k(t)$ and ${k}^{\mathrm{ins}}(t)$. We find that entanglement in the energy-extraction stage is a key resource. In addition, we consider a collection of two-level systems embedded in a two-mode microwave cavity with counterrotating terms, which shows that the counterrotating terms lead to a higher stored energy in the ultrastrong-coupling regime.

DOI
10.1103/physreva.108.062402

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We investigate a series of two-mode quantum batteries (QBs) which exhibits better performance in both the stored energy and average charging power compared to the two-photon case. In both the model related to coupling strength and Raman cases, we find the QBs can store energy faster and have a higher efficiency than the original case. Among the derived models we have studied, the two-mode Raman QB dependent on coupling strength has the best performance. We also present the relationship between the ergotropy and battery-charger entanglement of incoherent QBs and define the resource utilization efficiency k(t)k(t)k(t) and kins(t){k}^{\mathrm{ins}}(t)kins(t). We find that entanglement in the energy-extraction stage is a key resource. In addition, we consider a collection of two-level systems embedded in a two-mode microwave cavity with counterrotating terms, which shows that the counterrotating terms lead to a higher stored energy in the ultrastrong-coupling regime.
We consider a collection of two level systems, such as qubits, embedded into a microwave cavity as a promising candidate for the realization of high power quantum batteries. In this perspective, the possibility to design devices where the conventional single-photon coupling is suppressed and the dominant interaction is mediated by two-photon processes is investigated, opening the way to an even further enhancement of the charging performance. By solving a Dicke model with both single- and two-photon coupling we determine the range of parameters where the latter unconventional interaction dominates the dynamics of the system leading to better performances both in the charging times and average charging power of the QB compared to the single-photon case. In addition, the scaling of the maximum stored energy, fluctuations and charging power with the finite number of qubits NNN is inspected. While the energy and fluctuations scale linearly with NNN, the quadratic growth of the average power leads to a relevant improvement of the charging performance of quantum batteries based on this scheme with respect to the purely single-photon coupling case. Moreover, it is shown that the charging process is progressively faster by increasing the coupling from the weak to the ultra-strong regime.
Abstract Quantum batteries (QBs) have been proposed as devices that exploit the advantage of quantum resources, such as coherence and entanglement, to improve charging performance. In this study, we theoretically investigate a QB model based on two coupled double quantum dots (TDQDs) implemented on the well-established AlGaAs/GaAs platform for quantum nanodevice fabrication. Using ergotropy and power as key performance indicators, we examine how various system parameters affect the energy performance of the QB. Our study begins with an analysis of quantum resources in the QB’s initial state, followed by an examination of how control parameters that influence these resources impact the modeling and performance of the battery. Our results demonstrate that increasing the energy offset improves ergotropy and power but reduces quantum correlations. Conversely, increasing tunneling couplings leads to a non-monotonic variation in the maximum ergotropy, which peaks at a certain point before decreasing, closely following the behavior of quantum entanglement despite continued growth in quantum coherence. This highlights the feasibility of efficient energy storage in quantum dots (QDs) for use in quantum batteries (QBs). It also emphasizes that coherence alone is insufficient for optimal performance and that other quantum correlations are necessary and must be carefully considered to fully exploit the potential of quantum resources.
Quantum information theorems state that it is possible to exploit collective quantum resources to greatly enhance the charging power of quantum batteries (QBs) made of many identical elementary units. We here present and solve a model of a QB that can be engineered in solid-state architectures. It consists of N two-level systems coupled to a single photonic mode in a cavity. We contrast this collective model ("Dicke QB"), whereby entanglement is genuinely created by the common photonic mode, to the one in which each two-level system is coupled to its own separate cavity mode ("Rabi QB"). By employing exact diagonalization, we demonstrate the emergence of a quantum advantage in the charging power of Dicke QBs, which scales like sqrt[N] for N≫1.
We investigate the performances of multiphoton anisotropic Dicke quantum battery (QB), which couples a finite number NNN of identical and independent two-level systems (TLSs) to a unique cavity mode. Each transition of TLS is accompanied by the absorption or emission of lll photons from the cavity mode. In this model, the coupling constants of rotating and counterrotating wave terms are independent. Therefore, we utilize this interesting property to investigate the role of counterrotating wave terms and find that the higher the proportion of counterrotating wave terms, the higher the average power. Moreover, it is shown that the charging process is progressively faster by increasing the coupling strength from the weak to the ultrastrong and deep strong coupling regime. In the deep strong regime, the anti-Tavis-Cummings (ATC) coupling can almost achieve the optimal energy storage in a short time, which can be used to realize the feasibility of QB. Furthermore, we also analyze the effects of multiphoton interaction and single-multiphoton mixing process on the battery performances.
Abstract We investigate a three-level quantum battery (QB) coupled to a two-mode cavity, focusing on VVV-type, Ξ\XiΞ-type and Λ\LambdaΛ-type atomic configurations. Three-level QBs exhibit enhanced complexity in their characteristic properties compared to two-level QBs, arising fundamentally from their distinctive energy level configurations. By investigating three distinct classes of initial cavity states—Fock states, coherent states, and squeezed states—we demonstrate that adjusting the ratio of photon numbers at distinct frequencies enhances both the maximum stored energy and ergotropy, while simultaneously reducing the time to reach maximum stored energy. Moreover, while the cavity-environment interaction inevitably induces persistent energy dissipation, strategic manipulation of frequency-dependent photon decay rates enables optimization of three critical performance metrics: the maximum stored energy, maximum ergotropy, and charging power at the initialization stage.
Energy can be stored in quantum batteries by electromagnetic fields as chargers. In this paper, the performance of a quantum battery with single and double chargers is studied. It is shown that by using two independent charging fields, prepared in coherent states, the charging power of the quantum battery can be significantly improved, though the average number of embedded photons are kept the same in both scenarios. The results reveal that for the case of initially correlated states of the chargers, the amount of extractable energy, measured by ergotropy, is more than initially uncorrelated ones, with appropriate degrees of field intensity. Though the correlated chargers lead to greater reduction in the purity of the quantum battery, more energy and in turn more ergotropy are stored in this case. In addition, we study the battery-charger mutual information and von Neumann entropy and by using their relation we find that both quantum and classical correlations are generated between the quantum battery and chargers. We also study quantum consonance of the battery as the nonlocal coherence among its cells and find some qualitative relations between the generation of such correlations and the capability of energy storage in the quantum battery.