A Fluxonium Architecture for QEC, Part 1: Fast, High-Fidelity and Quantum Non-Demolition Readout

ORAL

Abstract

Fault-tolerant quantum computing remains a central goal of the superconducting qubit community, with fluxonium qubits showing significant promise due to their extended coherence times [1] and recent demonstrations of high-fidelity single-qubit [2] and two-qubit gates [3]. Despite this progress, two major challenges must be addressed before fluxonium qubits can be widely adopted for quantum error correction (QEC) applications: the development of fast, high-fidelity, quantum non-demolition measurement and the demonstration of an extensible two-qubit gate scheme resilient to spectator errors.

In this talk, we present a hardware-efficient scheme for fast, high-fidelity readout of the fluxonium qubit using a single dispersively coupled readout resonator. We mitigate Purcell loss in the computational subspace and second excited state by leveraging the unique level structure of the fluxonium qubit, and we study measurement-induced state transitions [4-5]. Notably, this approach does not require additional components, such as Purcell filters, simplifying the system architecture. Given the stringent requirements for repeated measurements in QEC, we believe these results highlight the potential of the fluxonium qubit for such applications.

[1] A. Somoroff, et al., PRL, 2023

[2] D. Rower, L. Ding, et al., arXiv:2406.08295, 2024

[3] L. Ding, et al., PRX, 2023

[4] M. Khezri, et al., PRA, 2023s

[5] M. F. Dumas, et al., arXiv:2402.06615, 2024

*This research was sponsored by IARPA and the Army Research Office, under the Entangled Logical Qubits program, and was accomplished under Cooperative Agreement Number W911NF-23-2-0212; by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Quantum Systems Accelerator; and under Air Force Contract No. FA8702-15-D-0001. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of IARPA, the Army Research Office, or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein.

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Presenters

  • Miguel S S. Moreira

    • MIT
    • Massachusetts Institute of Technology

Authors

  • Miguel S S. Moreira

    • MIT
    • Massachusetts Institute of Technology

  • Jorge F Marques

    • Massachusetts Institute of Technology

  • Alex A Chapple

    • Universite de Sherbrooke
    • Université de Sherbrooke

  • Boris M Varbanov

    • Université de Sherbrooke

  • Alexander McDonald

    • Université de Sherbrooke

  • William P Banner

    • Massachusetts Institute of Technology

  • Gabriel Cutter

    • Massachusetts Institute of Technology

  • Max Hays

    • MIT
    • Massachusetts Institute of Technology (MIT)
    • Massachusetts Institute of Technology

  • Helin Zhang

    • Massachusetts Institute of Technology

  • Konstantin Nesterov

    • Atlantic Quantum

  • Youngkyu Sung

    • Atlantic Quantum

  • Michael Gingras

    • MIT Lincoln Laboratory

  • Jeffrey M Knecht

    • MIT Lincoln Laboratory

  • Bethany M Niedzielski

    • MIT Lincoln Laboratory
    • Lincoln Laboratory, Massachusetts Institute of Technology

  • Hannah M Stickler

    • MIT Lincoln Laboratory

  • Mollie E Schwartz

    • MIT Lincoln Laboratory
    • Lincoln Laboratory, Massachusetts Institute of Technology

  • Alexandre Blais

    • Université de Sherbrooke

  • Kyle Serniak

    • MIT Lincoln Laboratory
    • Lincoln Laboratory, Massachusetts Institute of Technology

  • Jeffrey A Grover

    • Massachusetts Institute of Technology (MIT)
    • Massachusetts Institute of Technology
    • MIT

  • William D Oliver

    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology (MIT)