Cavity state manipulation using a dispersively coupled qubit

ORAL

Abstract

The large available Hilbert space and high coherence of cavity resonators makes them an interesting resource in quantum information processing. For example, several schemes exist to encode a logical qubit in such a harmonic oscillator in a way that would be protected against certain kinds of errors. Here we demonstrate a method to manipulate a cavity state using a far off-resonantly coupled qubit, using only linear controls and a gate we call the Selective Number Arbitrary Phase (SNAP) gate. This gate allows to impart an arbitrary phase on each Fock-state component of the cavity. We show how we can use these tools to correct for the effects of Kerr-evolution as well as how to create a single-photon Fock state. Our scheme can be generalized to arbitrary cavity state creation and even allows to construct arbitrary unitary operators to give universal control of the oscillator.

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Authors

  • Reinier W. Heeres

    Yale University, Yale Univ, Departments of Applied Physics and Physics, Yale University

  • Brian M. Vlastakis

    Yale University

  • Eric Holland

    Departments of Applied Physics and Physics, Yale University, Yale Univ, Yale University

  • Stefan I. Krastanov

    Yale Univ, Yale University

  • Victor V. Albert

    Departments of Applied Physics and Physics, Yale University, Yale University

  • Chao Shen

    Yale University

  • Liang Jiang

    Yale University, Departments of Applied Physics and Physics, Yale University, Yale Univ, Department of Applied Physics, Yale University, USA, Department of Applied Physics, Yale University

  • Robert Schoelkopf

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