Bosonic quantum error correction with heavy fluxonium: dispersive coupling in 3D (Part 1)

ORAL

Abstract

Bosonic codes store quantum information in the phase space of a quantum harmonic oscillator and offer a hardware-efficient path towards quantum error correction. In circuit QED, it is typical to realize bosonic error correction using a high-Q 3D superconducting cavity resonator, coupled to an auxiliary nonlinear element for measurement and universal control. Previous experiments have used fixed-frequency transmon qubits to implement the controller; however, it turns out that bit-flips in this control qubit are a dominant source of errors that can ultimately limit the performance of a bosonic code. In this work, we use a heavy fluxonium as a control qubit; unlike the transmon, this circuit exhibits a strong bit-flip protection when operated away from the sweet spot. We embed the heavy fluxonium into a 3D cavity architecture and demonstrate several key features of the device, such as the ability to tune the qubit-resonator interaction strength to zero using fast-flux control. Finally, we report on progress towards the creation and manipulation of Gottesman-Kitaev-Preskill states using this system.

* 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

  • Shoumik Chowdhury

    Massachusetts Institute of Technology (MIT)

Authors

  • Shoumik Chowdhury

    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

  • Shantanu R Jha

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

  • Miuko Tanaka

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

  • Patrick M Harrington

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

  • Michael A Gingras

    MIT Lincoln Laboratory

  • Jeffrey Knecht

    MIT Lincoln Lab, MIT Lincoln Laboratory

  • Bethany M Niedzielski

    MIT Lincoln Lab, MIT Lincoln Laboratory

  • Jonilyn L Yoder

    MIT Lincoln Lab, MIT Lincoln Laboratory

  • Mollie E Schwartz

    MIT Lincoln Laboratory

  • 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