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DY: Fachverband Dynamik und Statistische Physik

DY 20: Many-body Quantum Dynamics II (joint session DY/TT)

DY 20.10: Vortrag

Mittwoch, 19. März 2025, 12:00–12:15, H37

Period n-tupling in driven two level systems — •Dhruv Deshmukh and Joachim Ankerhold — Institute for complex quantum systems, Ulm University, Germany

This talk presents the necessary and sufficient conditions for realizing period n-tupling phenomena in periodically driven two-level systems. For the specific case of a two-level system driven linearly by a sinusoidal drive, we numerically identify the drive parameters that enable period n-tupling. Experimental results verifying period doubling in an NV centre driven by a microwave drive, are given. Further, we show that period quadrupling drives yield pulses which are much faster than the standard (Rabi) π/2 and π pulses built from weak drives. These stronger and faster pulses can be utilized for qubit manipulation, enabling faster gates and more efficient pulse sequences. Moreover, they inspire a new strategy for constructing efficient pulses using a Floquet theory approach to optimal control. Furthermore, the drive parameters could also be set to achieve period-1 (stroboscopic) dynamical freezing. The fragility of such phenomena can be exploited for sensing applications, as illustrated with an example in magnetometry.

Keywords: Period n-tupling; Floquet; Driven spin 1/2; Qubit control; NV centre