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Updated: Feb 10, 2026

The Lambda Select cII Mutation Detection System
Published on: April 26, 2018
Realization of a Λ System with Metastable States of a Capacitively Shunted Fluxonium
1The James Franck Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA.
Abstract:
We realize a Λ system in a superconducting circuit, with metastable states exhibiting lifetimes up to 8 ms. We exponentially suppress the tunneling matrix elements involved in spontaneous energy relaxation by creating a "heavy" fluxonium, realized by adding a capacitive shunt to the original circuit design. The device allows for both cavity-assisted and direct fluorescent readouts, as well as state preparation schemes akin to optical pumping. Since direct transitions between the metastable states are strongly suppressed, we utilize Raman transitions for coherent manipulation of the states.
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