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arXiv · 2606.05033

Crossover from Rabi oscillations to adiabatic population switching in the Faraday optical control of quantum dot spins

Jan M. Kaspari·Zhe Xian Koong·Dorian A. Gangloff·Michał Gawełczyk·Doris E. Reiter
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Abstract

Stimulated Raman transitions in Faraday geometry allow for simultaneous single-shot qubit readout and qubit control. It involves driving an unbalanced $\Lambda$ system via an auxiliary excited state. Due to the simultaneous driving of both transitions with unequal detuning, the resulting time-dependent Stark shift gives rise to additional resonance conditions beyond the conventional picture. We identify a distinct regime in which repeated passages through avoided crossings lead to step-like population inversion arising from Landau-Zener-St\"uckelberg interference. By changing the detuning beatnote, we demonstrate a controlled continuous crossover from Rabi-like oscillations to adiabatic population switching. These findings establish the oscillating Stark shift as a mechanism for engineering and controlling spin dynamics in Faraday geometry.

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Jan M. Kaspari, Zhe Xian Koong, Dorian A. Gangloff, Michał Gawełczyk, Doris E. Reiter. 2026-06-03. Crossover from Rabi oscillations to adiabatic population switching in the Faraday optical control of quantum dot spins. https://arxiv.org/abs/2606.05033

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