Giant energy oscillations mediated by a quasiperiodically driven qubit
Abstract
A qubit driven by two incommensurate frequencies can mediate a quantised average energy current in the adiabatic limit. We show that non-adiabatic processes result in reversals of the energy current and corresponding oscillations in the net energy transferred between the drives. The oscillations are bounded but giant -- much larger than the qubit energy splitting. A Landau-Zener analysis predicts that the timescale of the oscillations is exponentially large in the period of the drives. However, numerical analysis reveals that this timescale is not a monotonic function of the period, and has increasing sub-structure as the adiabatic limit is approached. We show that this non-monotonicity arises from interference effects between subsequent Landau-Zener transitions. Giant energy oscillations should be observable in near-term experiments with nitrogen-vacancy centers.
Cite
@article{arxiv.2304.01254,
title = {Giant energy oscillations mediated by a quasiperiodically driven qubit},
author = {Dominik Vuina and David M. Long and Phillip J. D. Crowley and Anushya Chandran},
journal= {arXiv preprint arXiv:2304.01254},
year = {2023}
}
Comments
10 pages, 8 figures