Ultra-dispersive resonator readout of a quantum-dot qubit using longitudinal coupling

Abstract

We perform readout of a quantum-dot hybrid qubit coupled to a superconducting resonator through a parametric, longitudinal interaction mechanism. Our experiments are performed with the qubit and resonator frequencies detuned by $\sim$10 GHz, demonstrating that longitudinal coupling can facilitate semiconductor qubit operation in the 'ultra-dispersive' regime of circuit quantum electrodynamics.

Main text and Supplementary Information; 13 pages, 7 figures

References in corpus (6)

• Coupling Superconducting Qubits via a Cavity Bus
• Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout
• Controlling the spontaneous emission of a superconducting transmon qubit
• Measurement-induced qubit state mixing in circuit QED from up-converted dephasing noise
• Excited-state spectroscopy on a nearly-closed quantum dot via charge detection
• Longitudinal coupling between a Si/SiGe quantum dot and an off-chip TiN resonator

Cited by in corpus (4)

• Parametric longitudinal coupling of a semiconductor charge qubit and a RF resonator
• Kinetic inductance coupling for circuit QED with spins
• Switchable spin-photon coupling with hole spins in single-quantum dots
• Spin-photon coupling using circular double quantum dots