Probing two-qubit capacitive interactions beyond bilinear regime using dual Hamiltonian parameter estimations

• URL: http://arxiv.org/abs/2206.04321v2
• Date: Thu, 30 Mar 2023 15:07:56 GMT
• Title: Probing two-qubit capacitive interactions beyond bilinear regime using dual Hamiltonian parameter estimations
• Authors: Jonginn Yun, Jaemin Park, Hyeongyu Jang, Jehyun Kim, Wonjin Jang, Youngwook Song, Min-Kyun Cho, Hanseo Sohn, Hwanchul Jung, Vladimir Umansky, Dohun Kim
• Abstract summary: We report the simultaneous operation and two-qubit coupling measurement of a pair of two-electron spin qubits in a GaAs quadruple quantum dot array. Coherent Rabi oscillations of both qubits are achieved by continuously tuning the drive frequency. By state conditional exchange oscillation measurements, we also observe strong two-qubit capacitive interaction.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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