Giant energy oscillations mediated by a quasiperiodically driven qubit

• URL: http://arxiv.org/abs/2304.01254v1
• Date: Mon, 3 Apr 2023 18:00:02 GMT
• Title: Giant energy oscillations mediated by a quasiperiodically driven qubit
• Authors: Dominik Vuina, David M. Long, Phillip J.D. Crowley, Anushya Chandran
• Abstract summary: 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.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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