Parametric longitudinal coupling between a high-impedance superconducting 
resonator and a semiconductor quantum dot singlet-triplet spin qubit

Bøttcher, C. G. L.; Harvey, S. P.; Fallahi, S.; Gardner, G. C.; Manfra, M. J.; Vool, U.; Bartlett, S. D.; Yacoby, A.

doi:10.1038/s41467-022-32236-w

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Parametric longitudinal coupling between a high-impedance superconducting resonator and a semiconductor quantum dot singlet-triplet spin qubit

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Bøttcher, C. G. L., Harvey, S. P., Fallahi, S., Gardner, G. C., Manfra, M. J., Vool, U., et al. (2022). Parametric longitudinal coupling between a high-impedance superconducting resonator and a semiconductor quantum dot singlet-triplet spin qubit. Nature Communications, 13: 4773, pp. 1-10. doi:10.1038/s41467-022-32236-w.

Cite as: https://hdl.handle.net/21.11116/0000-0010-097A-C

Abstract

Coupling qubits to a superconducting resonator provides a mechanism to enable long-distance entangling operations in a quantum computer based on spins in semiconducting materials. Here, we demonstrate a controllable spin-photon coupling based on a longitudinal interaction between a spin qubit and a resonator. We show that coupling a singlet-triplet qubit to a high-impedance superconducting resonator can produce the desired longitudinal coupling when the qubit is driven near the resonator’s frequency. We measure the energy splitting of the qubit as a function of the drive amplitude and frequency of a microwave signal applied near the resonator antinode, revealing pronounced effects close to the resonator frequency due to longitudinal coupling. By tuning the amplitude of the drive, we reach a regime with longitudinal coupling exceeding 1 MHz. This mechanism for qubit-resonator coupling represents a stepping stone towards producing high-fidelity two-qubit gates mediated by a superconducting resonator.