Towards a fluxonium-based quantum processor II: interacting qubits

ORAL

Abstract


We describe our progress in experimentally realizing a microwave-activated two-qubit gate with capacitively coupled fluxonium qubits. When biased at the flux sweet-spot, the individual qubits have frequencies around 500 MHz and reproducibly reach long coherence times in excess of 100 us (the best device had T2 > 300 us) [1]. A c-Phase gate can be achieved by sending a short 2π-pulse at the frequency near the 1→2 transition of the target qubit [2]. Our work includes characterization of coherence and parameter fluctuations in multi-qubit chips, modeling and experimentally validating the two-qubit interactions, optimizing the joint readout, and benchmarking of the gate operations.

[1] Nguyen et al., arXiv preprint arXiv:1810.11006v1 (2018)
[2] Nesterov et al., Phys. Rev. A 98, 030301 (2018)

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Presenters

  • Long Nguyen

    University of Maryland, College Park, University of Maryland-College Park, University of Maryland - College Park

Authors

  • Long Nguyen

    University of Maryland, College Park, University of Maryland-College Park, University of Maryland - College Park

  • Aaron Somoroff

    University of Maryland, College Park, University of Maryland-College Park, Physics, City College of City University of New York, University of Maryland - College Park

  • Yen-Hsiang Lin

    University of Maryland, College Park, University of Maryland-College Park, University of Maryland - College Park

  • Ray Mencia

    University of Maryland, College Park, University of Maryland-College Park, University of Maryland - College Park

  • Ivan Pechenezhskiy

    University of Maryland, College Park, University of Maryland-College Park, University of Maryland - College Park

  • Konstantin Nesterov

    University of Wisconsin, Madison, University of Wisconsin - Madison

  • Maxim Vavilov

    University of Wisconsin - Madison, Department of Physics, University of Wisconsin - Madison, University of Wisconsin, Madison, Physics, University of Wisconsin - Madison, Department of Physics, University of Wisconsin - Madison, Madison, WI 53706, University of Wisconsin-Madison

  • Vladimir Manucharyan

    Department of Physics, University of Maryland, University of Maryland, College Park, University of Maryland-College Park, Physics, University of Maryland, College Park, Department of Physics, University of Maryland, College Park, MD 20742, University of Maryland - College Park