Optimal Operation of a Josephson Parametric Amplifier for Vacuum Squeezing

M. Malnou, D. A. Palken, Leila R. Vale, Gene C. Hilton, and K. W. Lehnert
Phys. Rev. Applied 9, 044023 – Published 17 April 2018

Abstract

A Josephson parametric amplifier (JPA) can create squeezed states of microwave light, lowering the noise associated with certain quantum measurements. We experimentally study how the JPA’s pump influences the phase-sensitive amplification and deamplification of a coherent tone’s amplitude when that amplitude is commensurate with vacuum fluctuations. We predict and demonstrate that, by operating the JPA with a single current pump whose power is greater than the value that maximizes gain, the amplifier distortion is reduced and, consequently, squeezing is improved. Optimizing the singly pumped JPA’s operation in this fashion, we directly observe 3.87±0.03dB of vacuum squeezing over a bandwidth of 30 MHz.

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  • Received 7 November 2017
  • Revised 10 January 2018

DOI:https://doi.org/10.1103/PhysRevApplied.9.044023

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsQuantum Information, Science & Technology

Authors & Affiliations

M. Malnou1,2,*, D. A. Palken1,2, Leila R. Vale3, Gene C. Hilton3, and K. W. Lehnert1,2

  • 1JILA, National Institute of Standards and Technology and the University of Colorado, Boulder, Colorado 80309, USA
  • 2Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
  • 3National Institute of Standards and Technology, Boulder, Colorado 80305, USA

  • *maxime.malnou@colorado.edu

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Vol. 9, Iss. 4 — April 2018

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