Flopping-mode electron dipole spin resonance in the strong-driving regime Article Swipe
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· 2023
· Open Access
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· DOI: https://doi.org/10.1103/physrevb.107.035302
· OA: W4313557827
Achieving high fidelity control of spin qubits with conventional electron\ndipole spin resonance (EDSR) requires large magnetic field gradients of about 1\nmT/nm, which also couple the qubit to charge noise, and large drive amplitudes\nof order 1 mV. The flopping-mode is an alternative method to drive EDSR of an\nelectron in a double quantum dot, where the large displacement between both\ndots increases the driving efficiency. We propose to operate the flopping-mode\nin the strong-driving regime to use the full magnetic field difference between\nthe two dots. In simulations, the reduced required magnetic field gradients\nsuppress the infidelity contribution of charge noise by more than two orders of\nmagnitude, while providing Rabi frequencies of up to 60 MHz. However, the near\ndegeneracy of the conduction band in silicon introduces a valley degree of\nfreedom that can degrade the performance of the strong-driving mode. This\nnecessitates a valley-dependent pulse optimization and makes operation to the\nstrong-driving regime questionable.\n
