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Minimal construction of fully directional parametric amplifier

ORAL

Abstract

Quantum-limited parametric amplifiers based on Josephson junctions are indispensable components of superconducting quantum information processing machines. Traditionally, these are reflection amplifiers which need external non-reciprocal elements to separate the input from the output. It is possible however, to achieve non-reciprocal amplification in a multi-mode device by interfering multiple signal pathways between the input and the output mode. However, directional amplifiers based on this technique have lacked either output matching or adequate reverse isolation. In this talk, we present a new design for a fully directional parametric amplifier whose input and output ports are matched, and whose reverse transmission is much smaller than the inverse of the forward gain. We show that at least four modes and six parametric couplings are required to implement these amplifiers with Josephson-junction-only circuits. We further show that under realistic operating conditions, these devices can generate 20 dB forward gain and less than -20 dB reverse transmission, therefore enabling high efficiency quantum measurements and on-chip integration with qubit-cavity system.

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Presenters

  • Gangqiang Liu

    Yale University, Applied Physics Department, Yale University

Authors

  • Gangqiang Liu

    Yale University, Applied Physics Department, Yale University

  • Vidul Josh

    Yale University

  • Andrew Lingenfelter

    Physics, University of Chicago, University of Chicago

  • Nicholas Frattini

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

  • Shyam Shankar

    University of Texas at Austin, Yale University, Department of electrical and computer engineering, University of Austin, Yale University, Univ. of Texas at Austin

  • Michel Devoret

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