Two-tone spectroscopy of high-frequency quantum circuits with a Josephson emitter

Abstract

We perform two-tone spectroscopy on quantum circuits, where high-frequency radiation is generated by a voltage-biased superconductor-normal-superconductor Josephson junction and detection is carried out by an ancillary microwave resonator. We implement this protocol on two different systems, a transmon qubit and a $\lambda /4$ resonator. We demonstrate that this two-tone Josephson spectroscopy operates well into the millimeter-wave band, reaching frequencies larger than 80 GHz, and is well-suited for probing highly coherent quantum systems.

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• Demonstration of an ac Josephson junction laser
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Cited by in corpus (4)

• Towards a $\cos (2\phi )$ Josephson element using aluminum junctions with well-transmitted channels
• Slave-spin approach to the Anderson-Josephson quantum dot
• DC-operated Josephson junction arrays as a cryogenic on-chip microwave measurement platform
• Tunable Josephson voltage source for quantum circuits