Parity measurements using parametrically driven resonators: Part I

ORAL

Abstract

Multi-qubit parity measurements are indispensable for quantum error correction. A possible way to realize these is by homodyne measurement of the field of a cavity which is dispersively coupled to multiple qubits. However such an interaction can lead to dephasing within the parity subspace and results in only half-parity measurement. With the aim of overcoming this shortcoming, in this talk we will introduce the parametrically driven nonlinear resonator as an alternate approach to measure multi-qubit parity. With analytical results, we will show that this approach leads to significant reduction of parity-subspace dephasing making full-parity measurements possible.

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Presenters

  • Shruti Puri

    Department of Physics, Yale University

Authors

  • Shruti Puri

    Department of Physics, Yale University

  • Baptiste Royer

    Institut quantique and Départment de Physique, Université de Sherbrooke, Institut Quantique and Département de Physique, Université de Sherbooke, University of Sherbrooke, Institut quantique and Département de Physique, Université de Sherbrooke, Institut Quantique and Département de Physique, Université de Sherbrooke, Department of Physics, University of Sherbrooke

  • Steven Girvin

    Yale University, Applied Physics, Yale University, Department of Physics, Yale University, Yale Quantum Institute, Yale University

  • Alexandre Blais

    Institut quantique and Departement de Physique, Universite de Sherbrooke, Physique, Institut Quantique, University of Sherbrooke, Institut quantique and Department de Physique, Universite de Sherbrooke, Physique, Universite de Sherbrooke, Physics, University of Sherbrooke, Institut quantique and Départment de Physique, Université de Sherbrooke, Institut Quantique and Département de Physique, Université de Sherbrooke, Univ of Sherbrooke, Institut Quantique and Département de Physique, Université de Sherbooke, Institut quantique and Département de Physique, Université de Sherbrooke, Department of Physics, University of Sherbrooke