Realization of a $\Lambda$ system with metastable states of a capacitively-shunted fluxonium

Abstract

We realize a $\Lambda$ 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 readout, 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.

Total of 10 pages. 5 pages in main tex, and 5 in supplement. Total of 9 figures in entire document

References in corpus (9)

• Charge insensitive qubit design derived from the Cooper pair box
• Surface codes: Towards practical large-scale quantum computation
• Hardware-efficient Variational Quantum Eigensolver for Small Molecules and Quantum Magnets
• Systematic evaluation of an atomic clock at 2e-18 total uncertainty
• Controlling the spontaneous emission of a superconducting transmon qubit
• Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit
• Scalable quantum circuit and control for a superconducting surface code
• Universal stabilization of a parametrically coupled qubit
• Protecting a superconducting qubit from energy decay by selection rule engineering

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