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Quantum Physics
Title: Probing two-qubit capacitive interactions beyond bilinear regime using dual Hamiltonian parameter estimations
(Submitted on 9 Jun 2022 (v1), last revised 30 Mar 2023 (this version, v2))
Abstract: We report the simultaneous operation and two-qubit coupling measurement of a pair of two-electron spin qubits that are actively decoupled from quasistatic nuclear noise in a GaAs quadruple quantum dot array. Coherent Rabi oscillations of both qubits (decay time $\approx$2 {\mu}s; frequency few MHz) are achieved by continuously tuning the drive frequency using rapidly converging real-time Hamiltonian estimators. By state conditional exchange oscillation measurements, we also observe strong two-qubit capacitive interaction (> 190 MHz). We show that the scaling of the capacitive interaction with respect to intra-qubit exchange energies is stronger than the bilinear form, consistent with recent theoretical predictions. We observe a high ratio (>16) between coherence and conditional phase-flip time, which supports the possibility of generating high-fidelity and fast quantum entanglement between encoded spin qubits using a simple capacitive interaction.
Submission history
From: Jonginn Yun [view email][v1] Thu, 9 Jun 2022 07:49:07 GMT (1680kb)
[v2] Thu, 30 Mar 2023 15:07:56 GMT (2007kb)
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