Non-destructive optical readout of a superconducting qubit

• DOI: 10.48550/arxiv.2110.09539
• Publication Date: 2021-01-01
• Authors: Robert D. Delaney; Maxwell D. Urmey; Sarang Mittal; B. M. Brubaker; Jonathan M. Kindem; Peter S. Burns; C. A. Regal; K. W. Lehnert
• Keywords: Flux qubit

Entangling superconducting quantum processors via light would enable new means of secure communication and distributed computing. However, transducing signals between these disparate regimes the electromagnetic spectrum remains an outstanding goal, interfacing qubits with electro-optic transducers presents significant challenges due to deleterious effects optical photons on superconductors. Moreover, many remote entanglement protocols require multiple qubit gates both preceding following upconversion state, thus ideal transducer should leave state unchanged: more precisely, backaction from be minimal. Here we demonstrate non-destructive readout a transmon continuously operated transducer. The modular nature circuit QED system used in this work complete isolation photons, is less than that imparted by thermal radiation environment. Moderate improvements bandwidth added noise will us leverage full suite tools available transduction non-classical domain.