Entangled Schrodinger cats in circuit QED: Experimental Architecture

ORAL

Abstract

The development of quantum information technology relies on creating and controling entanglement over an increasingly large Hilbert space. Superconducting cavities offer high-dimensional spaces for quantum states in a low-loss and hardware-efficient fashion, making it an ideal memory of quantum information and an important element towards fault-tolerant quantum computation. In this talk we present a cQED architecture that allows quantum control over the coherent state basis of two superconducting cavities with millisecond coherence. In particular, we show deterministic entanglement of coherent-state microwave fields in two superconducting cavities of the form: $\frac{1}{\sqrt 2 }\left( {\left| \right.\left. {\beta_{a} } \right\rangle \left| \right.\left. {\beta_{a} } \right\rangle \pm \left| - \right.\left. {\beta_{a} } \right\rangle \left| - \right.\left. {\beta_{a} } \right\rangle } \right)$. We engineer the capability to measure the joint photon number parity to achieve complete state tomography of the two-cavity state. Following widespread efforts of realizing ``Schrodinger's cat''-like mesoscopic superposition in various physical systems, this experiment demonstrates mesoscopic entanglement between two ``Schrodinger's cats''.

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Authors

  • Chen Wang

    Department of Applied Physics, Yale University, Department of Applied Physics and Physics, Yale University, Yale University

  • Yvonne Y. Gao

    Department of Applied Physics, Yale University, Department of Applied Physics and Physics, Yale University, Yale University

  • P. Reinhold

    Yale University, Yale University, Department of Applied Physics, Yale University Department of Applied Physics

  • R. Heeres

    Yale University, Yale University, Department of Applied Physics, Yale University Department of Applied Physics

  • N. Ofek

    Yale University, Yale University, Department of Applied Physics, Yale University Department of Applied Physics

  • Kevin Chou

    Yale University

  • C. Axline

    Yale University

  • L. Frunzio

    Yale University, Department of Applied Physics, Yale University, Department of Applied Physics and Physics, Yale University, Yale University, Department of Applied Physics, Yale University Department of Applied Physics

  • M. H. Devoret

    Yale University, Department of Applied Physics, Yale University, Yale Univesity, Department of Applied Physics and Physics, Yale University, Yale University, Department of Applied Physics, Yale University Department of Applied Physics

  • R. J. Schoekopf

    Yale University, Department of Applied Physics, Yale University, Department of Applied Physics and Physics, Yale University, Department of Physics and Applied Physics, Yale University, New Haven, Connecticut, Departments of Applied Physics and Physics, Yale University, New Haven, Connecticut, USA., Yale University, Department of Applied Physics, Yale University Department of Applied Physics