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

Physics

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

J. Yun, J. Park, et al.

This groundbreaking research from Jonginn Yun, Jaemin Park, Hyeongyu Jang, and colleagues explores the remarkable coherence of two-electron spin qubits in a GaAs quadruple quantum dot array. Witness how they achieve robust entanglement through strong capacitive interactions, promising a leap forward in quantum computing fidelity.

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Playback language: English
Abstract
This paper reports 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 are achieved using real-time Hamiltonian estimators. Strong two-qubit capacitive interaction (>190 MHz) is observed, exceeding the bilinear regime. A high ratio (>16) between coherence and conditional phase-flip time supports high-fidelity, fast quantum entanglement generation using capacitive interaction.
Publisher
npj Quantum Information
Published On
Mar 29, 2023
Authors
Jonginn Yun, Jaemin Park, Hyeongyu Jang, Jehyun Kim, Wonjin Jang, Younguk Song, Min-Kyun Cho, Hanseo Sohn, Hwanchul Jung, Vladimir Umansky, Dohun Kim
Tags
quantum computing
spin qubits
GaAs quadruple quantum dots
entanglement generation
capacitive interaction
coherence
nuclear noise

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