Bosonic quantum error correction with heavy fluxonium: parametric coupling in 2D (Part 2)

ORAL

Abstract

Bosonic quantum error correction (QEC) encodes information in the phase space of a quantum harmonic oscillator and offers a hardware-efficient path towards fault-tolerant quantum information processing. With superconducting circuits, bosonic QEC using the Gottesman-Kiteav-Preskill (GKP) encoding has been achieved using the high-Q mode of a macroscopic 3D microwave cavity controlled via fixed-frequency transmon qubits. To date, all previous demonstrations have been limited by bit-flips in the transmon control qubit (with typical T1 lifetimes on the order of 100 microseconds), resulting in logical lifetimes that are upper-bounded by approximately ~10T1. In this work, we build on previous work to replace a transmon with a heavy-fluxonium control qubit, which has been shown to possess bit-flip lifetimes in excess of 1 millisecond. Furthermore, we propose using the asymmetrically threaded SQUID as a microwave-activated three-wave mixing coupler to yield faster GKP error-correction rates while suppressing inherited nonlinearity in our bosonic mode. As compared to direct dispersive coupling, this parametric coupling enables us to use a heavier, and therefore more bit-flip-protected, fluxonium qubit. Finally, with an accelerated error correction rate, we can use a lower-Q planar resonator to store logical quantum information in an extensible and fully 2D architecture.

* This research was funded in part by the Army Research Office under Award Number W911NF-23-1-0045; by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Co-design Center for Quantum Advantage (C2QA) under contract number DE-SC0012704; by the AWS Center for Quantum Computing; and by the Under Secretary of Defense for Research and Engineering under Air Force Contract No. FA8702-15-D-0001. M. H. acknowledges funding from the IC Postdoctoral Fellowship. S. C. and S. R. J. acknowledge support from the NSF Graduate Research Fellowship. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the U.S. Government.

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Presenters

  • Shantanu R Jha

    Massachusetts Institute of Technology, Massachusetts Institute of Technology (MIT)

Authors

  • Shantanu R Jha

    Massachusetts Institute of Technology, Massachusetts Institute of Technology (MIT)

  • Max Hays

    MIT, Massachusetts Institute of Technology (MIT), Massachusetts Institute of Technology MI, Massachusetts Institute of Technology, Massachussets Institute of Technology, Massachusetts Institute of Technology MIT

  • Shoumik Chowdhury

    Massachusetts Institute of Technology (MIT)

  • David Pahl

    Massachusetts Institute of Technology

  • Junyoung An

    Massachusetts Institute of Technology MI, Massachusetts Institute of Technology

  • Michael A Gingras

    MIT Lincoln Laboratory

  • Bethany M Niedzielski

    MIT Lincoln Lab, MIT Lincoln Laboratory

  • Hannah M Stickler

    MIT Lincoln Laboratory

  • Jonilyn L Yoder

    MIT Lincoln Lab, MIT Lincoln Laboratory

  • Mollie E Schwartz

    MIT Lincoln Laboratory

  • Baptiste Royer

    Université de Sherbrooke

  • Kyle Serniak

    MIT Lincoln Laboratory & MIT RLE, MIT Lincoln Laboratory, MIT Lincoln Laboratory, MIT RLE

  • Jeffrey A Grover

    Massachusetts Institute of Technology, Massachusetts Institute of Technology (MIT), Massachusetts Institute of Technology MIT

  • William D Oliver

    Massachusetts Institute of Technology MI, Massachusetts Institute of Technology, Massachusetts Institute of Technology (MIT), Massachusetts Institute of Technology MIT