Characterization of a Two-Photon Quantum Battery: Initial Conditions, Stability and Work Extraction

Abstract

We consider a quantum battery that is based on a two-level system coupled with a cavity radiation by means of a two-photon interaction. Various figures of merit, such as stored energy, average charging power, energy fluctuations, and extractable work are investigated, considering, as possible initial conditions for the cavity, a Fock state, a coherent state, and a squeezed state. We show that the first state leads to better performances for the battery. However, a coherent state with the same average number of photons, even if it is affected by stronger fluctuations in the stored energy, results in quite interesting performance, in particular since it allows for almost completely extracting the stored energy as usable work at short enough times.

Enhancing coherent energy transfer between quantum devices via a mediator

“…In addition, coherent states in the cavity (not shown) at average photon number n are less performant with respect to the corresponding Fock states at fixed n as long as this number is small. For large n the performances in the two cases tend to approach [35,39]. Figure 8: Behavior of the estimator ζ(t) as function of ωBt for the cavity-mediated energy transfer case.…”

“…[17], various theoretical proposals have been elaborated with the aim of realizing miniaturized devices able to exploit genuine quantum features to store and release energy in a controlled way. They can be implemented in set-ups conventionally used for quantum computation [18,19], in artificial atoms [20][21][22][23][24][25][26][27][28][29][30][31] and in the framework of cavity and circuit quantum electrodynamics [32][33][34][35][36]. These theoretical investigations represent a change of paradigm in the field of energy storage with respect to two centuries old electrochemical principles which are still at the core of nowadays technology.…”

IBM quantum platforms: a quantum battery perspective

“…During the years, the studies progressively moved towards more experimentally oriented proposals. They addressed set-ups conveniently designed in such a way to be easily implemented on existing quantum computing platforms such as arrays of artificial atoms [10][11][12][13][14][15][16][17] and systems for cavity and circuit quantum electrodynamics [18][19][20][21][22]. Very remarkably, the first experimental evidence of a QB has been reported less than one year ago in a system where fluorescent organic molecules play the role of two-level systems embedded in a microcavity [23].…”

Nonequilibrium thermal transport and photon squeezing in a quadratic qubit-resonator system

“…Interestingly, the reaction coordinate mapping tries to theoretically establish the bridge between the SBM and the coupled qubit-resonator system [16,[30][31][32][33][34]. Recently, two-photon based quadratic interaction in HQSs, e.g., two-photon Rabi model, has attracted increasing attention, which has practical correspondence in the circuit-QED platform [35,36], and theoretically leads to spectral collapse [37,38], quantum phase transition [39][40][41], ultrafast charging quantum battery [42,43] and enhancement of superradiant spontaneous emission [44]. Moreover, such nonlinear interactions play a crucial role in modeling the electric current based on the quantum dot-vibration hybrid model [45].…”