Longitudinal coupling between a Si/SiGe quantum dot and an off-chip TiN resonator
arXiv:2212.02736 · doi:10.1103/PhysRevApplied.20.064005
Abstract
Superconducting cavities have emerged as a key tool for measuring the spin states of quantum dots. So far however, few experiments have explored longitudinal couplings between dots and cavities, and no solid-state qubit experiments have explicitly probed the "adiabatic" regime, where the Purcell decay is strongly suppressed. Here, we report measurements of a double-quantum-dot charge qubit coupled to a high-impedance resonator via a "flip-chip" design geometry. By applying an adiabatic ac drive to the qubit through two different channels, and studying the effects of qubit energy detuning, interdot tunneling, and driving strength, we are able to unequivocally confirm the presence of a longitudinal coupling between the qubit and cavity, while the qubit remains in its ground state. Since this coupling is proportional to the driving amplitude, and is therefore switchable, it has the potential to become a powerful new tool in qubit experiments.
arXiv commentMain text and Supplementary Materials, 16 pages, 10 figures
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- Cavity-mediated entanglement of parametrically driven spin qubits via sidebands
- Unifying Floquet theory of longitudinal and dispersive readout
- Ultra-dispersive resonator readout of a quantum-dot qubit using longitudinal coupling
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- Spin-photon coupling using circular double quantum dots