2023
DOI: 10.1038/s41534-023-00699-4
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Probing two-qubit capacitive interactions beyond bilinear regime using dual Hamiltonian parameter estimations

Abstract: We report the simultaneous operation and two-qubit-coupling measurement of a pair of two-electron spin qubits, actively decoupled from quasi-static nuclear noise in a GaAs quadruple quantum dot array. Coherent Rabi oscillations of both qubits (decay time ≈2 μs; frequency few MHz) are achieved by continuously tuning their drive frequency using rapidly converging real-time Hamiltonian estimators. We observe strong two-qubit capacitive interaction (>190 MHz), combined with detuning pulses, inducing a state-con… Show more

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Cited by 4 publications
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