Enhancing coherent energy transfer between quantum devices via a mediator

Abstract

We investigate the coherent energy transfer between two quantum systems mediated by a quantum bus. In particular, we consider the energy transfer process between two qubits, and how it can be influenced by using a third qubit or photons in a resonant cavity as mediators. Inspecting different figures of merit and considering both on and off-resonance configurations, we characterize the energy transfer performances. We show that, while the qubit-mediated transfer only offers very few advantages with respect to a direct coupling case, the cavity-mediated one is progressively more and more efficient as a function of the number of photons stored in the cavity that acts as a quantum bus. The speeding-up of the energy transfer time, due to a quantum mediator paves the way for new architecture designs in quantum technologies and energy based quantum logics.

IBM quantum platforms: a quantum battery perspective

“…The majority of the considered approaches for QBs are based on two-level systems (qubits) promoted from the ground to the excited state by means of the action of another system playing the role of a charger [26][27][28]. This latter element can be genuinely quantum, such as photons trapped into a cavity [18], or more simply a classical time dependent drive directly applied to the qubit [14,29,30].…”