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

N. Earnest, S. Chakram, Y. Lu, N. Irons, R. K. Naik, N. Leung, L. Ocola, D. A. Czaplewski, B. Baker, Jay Lawrence, Jens Koch, D. I. Schuster

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


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.

Original languageEnglish (US)
Article number150504
JournalPhysical review letters
Issue number15
StatePublished - Apr 13 2018

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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