Parametric Longitudinal Coupling Between a High-impedance Superconducting Resonator and a Semiconductor Quantum Dot Singlet-triplet Spin Qubit

Overview

Journal Nat Commun

Specialty Biology

Date 2022 Aug 15

PMID 35970821

Authors

C G L Bottcher

S P Harvey

S Fallahi

G C Gardner

M J Manfra

U Vool

S D Bartlett

A Yacoby

Affiliations

Soon will be listed here.

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.

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