Electron shelving of a superconducting artificial atom

Cottet, Nathanaël; Xiong, Haonan; Nguyen, Long B.; Lin, Yen-Hsiang; Manucharyan, Vladimir E.

doi:10.1038/s41467-021-26686-x

Electron shelving of a superconducting artificial atom

Journal Article · Thu Nov 04 00:00:00 EDT 2021 · Nature Communications

DOI:https://doi.org/10.1038/s41467-021-26686-x· OSTI ID:1894049

Cottet, Nathanaël ^[1]; ^[2]; ^[2]; Lin, Yen-Hsiang ^[2]; ^[2]

Univ. of Maryland, College Park, MD (United States); Université Claude-Bernard Lyon 1 (UCBL) (France)
Univ. of Maryland, College Park, MD (United States)

Interfacing long-lived qubits with propagating photons is a fundamental challenge in quantum technology. Cavity and circuit quantum electrodynamics (cQED) architectures rely on an off-resonant cavity, which blocks the qubit emission and enables a quantum non-demolition (QND) dispersive readout. However, no such buffer mode is necessary for controlling a large class of three-level systems that combine a metastable qubit transition with a bright cycling transition, using the electron shelving effect. Here we demonstrate shelving of a circuit atom, fluxonium, placed inside a microwave waveguide. With no cavity modes in the setup, the qubit coherence time exceeds 50 μs, and the cycling transition’s radiative lifetime is under 100 ns. By detecting a homodyne fluorescence signal from the cycling transition, we implement a QND readout of the qubit and account for readout errors using a minimal optical pumping model. Our result establishes a resource-efficient (cavityless) alternative to cQED for controlling superconducting qubits.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); US Army Research Office (ARO)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1894049

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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