Science Daily June 15, 2022
Transducing quantum signals between disparate regimes of the electro-magnetic spectrum remains an outstanding goal. Many remote entanglement protocols require multiple qubit gates both preceding and following the upconversion of the quantum state, and thus an ideal transducer should impart minimal backaction on the qubit. A team of researchers in the US (University of Colorado, NIST) demonstrated readout of a superconducting transmon qubit through a low-backaction electro-optomechanical transducer. The modular nature of the transducer and circuit quantum electrodynamics system used in this work enabled complete isolation of the qubit from optical photons, and the backaction on the qubit from the transducer is less than that imparted by thermal radiation from the environment. Moderate improvements in the transducer bandwidth and the added noise enabled them to leverage the full suite of tools available in circuit quantum electrodynamics to demonstrate transduction of non-classical signals from a superconducting qubit to the optical domain…read more. TECHNICAL ARTICLE
Apparatus for readout of a superconducting qubit via electro-optic transduction. Credit: Nature volume 606, pages489–493 (2022)Â