Stroboscopic qubit measurement with injected squeezed light, Part 1: Controlling measurement backaction

ORAL

Abstract

As new amplification technologies permit ever faster and quieter measurements of superconducting qubits, further measurement acceleration will require alternative approaches to improve the signal-to-noise ratio achieved in a set acquisition time. Here we demonstrate the enhancement of qubit measurements using the injection of squeezed electromagnetic vacuum. Our platform combines a stroboscopic measurement technique with an interferometric configuration of parametric amplifiers to produce optimally-squeezed phase sensitive readout. In this first of two talks, we present an overview of our measurement setup and demonstrate how squeezing provides additional control over measurement backaction. We emphasize that we can slow measurement-induced dephasing by a factor of two, thereby exhibiting an important capability for future efforts toward higher fidelity multi-qubit gates.

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Authors

  • Sydney Schreppler

    Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, CA 94720, USA.

  • Andrew Eddins

    Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, CA 94720, USA., Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, California 94720, USA., Quantum Nanoelectronics Laboratory

  • David Toyli

    Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, CA 94720, USA., Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, California 94720, USA.

  • Leigh Martin

    Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, CA 94720, USA., University of California, Berkeley, Quantum Nanoelectronics Laboratory,Department of Physics, University of California, Berkeley, Univ of California - Berkeley, Quantum Nanoelectronics Lab, Center for Quantum Coherent Sciences, UC Berkeley

  • Shay Hacohen-Gourgy

    University of California, Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, CA 94720, USA., University of California, Berkeley, Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley CA 94720, USA., Quantum Nanoelectronics Laboratory,Department of Physics, University of California, Berkeley

  • Luke C.G. Govia

    McGill University, McGill University, Montreal, Quebec, Canada.

  • Hugo Ribeiro

    Department of physics, McGill University, McGill University, Montreal, Quebec, Canada., McGill University

  • Aash Clerk

    Department of physics, McGill University, McGill Univ, McGill University, McGill University, Montreal, Quebec, Canada., Department of Physics, McGill University, 3600 Rue University, Montreal, Quebec H3A 2T8, Canada.

  • Irfan Siddiqi

    Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley CA 94720, USA, Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, CA 94720, USA., Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley CA 94720, USA., University of California, Berkeley, Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, California 94720, USA., Quantum Nanoelectronics Laboratory, Quantum Nanoelectronics Laboratory,Department of Physics, University of California, Berkeley, Quantum Nanoelectronics Lab, Center for Quantum Coherent Sciences, UC Berkeley