Dispersive qubit measurement using an integrated on-chip parametric amplifier
ORAL
Abstract
Superconducting parametric amplifiers (paramps) enable readout of superconducting qubits with unparalleled speed and efficiency. A variety of amplifier designs have been successfully used for readout; however, the most widely used devices require additional microwave components between qubit and paramp, limiting measurement efficiency and scalability. Our work aims to integrate qubit and amplifier on-chip, exploiting two-mode operation of the paramp to minimize measurement backaction on the qubit. To this end, we have developed a flux-pumped, high dynamic range amplifier compatible with qubit integration, and characterized the combined qubit-paramp circuit. We will discuss device design considerations and fabrication, studies of measurement-induced qubit dephasing in the presence of amplification, and prospects for enhanced weak, continuous measurements as well as strong, projective readout.
*This work was supported by funding from the Army Research Office.
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