Continuously monitoring the parity of superconducting qubits in a 2D cQED architecture

ORAL

Abstract

Continuous measurements of joint qubit properties such as their parity can reveal insight into the collapse dynamics of entangled states and are a prerequisite for implementing continuous quantum error correction. Here it is crucial that the measurement collects no information other than the parity to avoid measurement induced dephasing. In a cQED architecture, a full-parity measurement can be implemented by strongly coupling two transmon qubits to a single high-Q planar resonator ($\chi \gg \kappa$). We will discuss the experimental implementation of this on-chip technique and the prospects to extend it to more qubits. This will allow us to monitor, in real-time, the projection into multi-partite entangled states and continuously detect errors on a logical qubit encoded in an entangled subspace.

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Authors

  • Machiel Blok

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

  • Emmanuel Flurin

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

  • William Livingston

    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, Quantum Nanoelectronics Lab, Center for Quantum Coherent Sciences, UC Berkeley

  • James Colless

    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.

  • Allison Dove

    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

  • 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