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Observing a dynamical purification phase transition in a trapped-ion quantum computer

ORAL

Abstract

We report on experimental studies of a novel error correction threshold called a “purification transition” that occurs as we tune the rate of measurement during random unitary dynamics. We use a single reference qubit entangled with the larger system to efficiently study the purification dynamics. We probe the two phases by sampling hundreds of instances of random circuits using a quantum computer with 13 trapped 171Yb+ ions as the qubits. Sampling the large subset of circuits requires calibrations and circuit running on long timescales with high fidelity. On the accessible circuit depths and system sizes, we find conclusive evidence of the different phases and show numerically that, in the limits of longer circuits and moderately larger system sizes, critical properties of the purification transition emerge.

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Presenters

  • Crystal Noel

    JQI and QuiCS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics (and ECE), Duke University, Durham, NC, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics (and ECE), Duke University, Durham NC 2, University of Maryland, College Park

Authors

  • Crystal Noel

    JQI and QuiCS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics (and ECE), Duke University, Durham, NC, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics (and ECE), Duke University, Durham NC 2, University of Maryland, College Park

  • Pradeep Niroula

    University of Maryland, College Park, JQI, QuICS, NIST, Department of Physics, University of Maryland, College Park, MD 20742;

  • Marko Cetina

    JQI and QuiCS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics, Duke University, Durham, NC 27701, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics, Duke University, Durham NC 27701, University of Maryland, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics, Duke University, Durham NC 27, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics (and ECE), Duke University, Durham NC 2

  • Daiwei Zhu

    JQI and QuICS and Departments of ECE and Physics, University of Maryland, College Park, MD 20742, University of Maryland, College Park, JQI and QuICS and Departments of Physics and ECE, University of Maryland, College Park, MD 20742

  • Andrew Risinger

    JQI and QuICS and Departments of ECE and Physics, University of Maryland, College Park, MD 20742

  • Laird Egan

    JQI and QuiCS and Department of Physics, University of Maryland, College Park, MD 20742, University of Maryland, College Park, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center, Duke University, Durham NC 27701, Joint Quantum Institute and Center for Quantum Information and Computer Science, NIST/University of Maryland, College Park, MD 20742

  • Debopriyo Biswas

    JQI and QuiCS and Department of Physics, University of Maryland, College Park, MD 20742, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742, University of Maryland, College Park, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742;, Joint Quantum Institute and Center for Quantum Information and Computer Science, NIST/University of Maryland, College Park, MD 20742

  • Alexey V Gorshkov

    JQI, National Institute of Standards and Technology, Joint Quantum Institute and Joint Center for Quantum Information and Computer Science, University of Maryland and NIST, College Park, MD 20742 USA, JQI, NIST, QuICS and Department of Physics, University of Maryland, College Park, MD 20742;, Joint Quantum Institute, NIST/University of Maryland, College Park, Maryland 20742 USA

  • Michael Gullans

    National Institute of Standards and Tech, JQI, NIST, QuICS and Department of Physics, University of Maryland, College Park, MD 20742

  • David A Huse

    Princeton University, Department of Physics, Princeton University, Princeton NJ 08540

  • Christopher R Monroe

    JQI and QuiCS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics (and ECE), Duke University, Durham, NC, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics (and ECE), Duke University, Durham NC 2, University of Maryland, College Park, Joint Quantum Institute, University of Maryland, College Park, Joint Quantum Institute and Joint Center for Quantum Information and Computer Science, University of Maryland and NIST, College Park, MD 20742 USA, JQI, University of Maryland, College Park, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics (and ECE), Duke University, Durham NC 27, Joint Quantum Institute, Joint Center for Quantum Information and Computer Science, and Physics Department, University of Maryland, College Park and National Institute of Sta