Realization of a Λ System with Metastable States of a Capacitively Shunted Fluxonium

Physical Review Letters
N EarnestD I Schuster

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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Citations

May 1, 2019·Nature Materials·Lukas GrünhauptIoan M Pop
May 15, 2018·Physical Review Letters·Yen-Hsiang LinVladimir E Manucharyan
Apr 2, 2019·Physical Review Letters·Tongxing YanDapeng Yu
Aug 17, 2020·Physical Review Letters·T W LarsenC M Marcus
Apr 24, 2019·Physical Review Letters·T M HazardA A Houck

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