Squeezing with a flux-driven Josephson parametric amplifier

L Zhong; E P Menzel; R Di Candia; P Eder; M Ihmig; A Baust; M Haeberlein; E Hoffmann; K Inomata; T Yamamoto; Y Nakamura; E Solano; F Deppe; A Marx; R Gross

doi:10.1088/1367-2630/15/12/125013

New Journal of Physics (Jan 2013)

Squeezing with a flux-driven Josephson parametric amplifier

L Zhong,
E P Menzel,
R Di Candia,
P Eder,
M Ihmig,
A Baust,
M Haeberlein,
E Hoffmann,
K Inomata,
T Yamamoto,
Y Nakamura,
E Solano,
F Deppe,
A Marx,
R Gross

Affiliations

L Zhong: Walther-Meißner-Institut , Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany; Physik-Department, Technische Universität München , D-85748 Garching, Germany
E P Menzel: Walther-Meißner-Institut , Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany; Physik-Department, Technische Universität München , D-85748 Garching, Germany
R Di Candia: Department of Physical Chemistry, University of the Basque Country UPV/EHU , Apartado 644, E-48080, Bilbao, Spain
P Eder: Walther-Meißner-Institut , Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany; Physik-Department, Technische Universität München , D-85748 Garching, Germany
M Ihmig: Lehrstuhl für Integrierte Systeme, Technische Universität München , D-80333 München, Germany
A Baust: Walther-Meißner-Institut , Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany; Physik-Department, Technische Universität München , D-85748 Garching, Germany
M Haeberlein: Walther-Meißner-Institut , Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany; Physik-Department, Technische Universität München , D-85748 Garching, Germany
E Hoffmann: Walther-Meißner-Institut , Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany; Physik-Department, Technische Universität München , D-85748 Garching, Germany
K Inomata: RIKEN Center for Emergent Matter Science (CEMS), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
T Yamamoto: RIKEN Center for Emergent Matter Science (CEMS), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; NEC Smart Energy Research Laboratories, Tsukuba, Ibaraki, 305-8501, Japan
Y Nakamura: RIKEN Center for Emergent Matter Science (CEMS), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; Research Center for Advanced Science and Technology (RCAST), The University of Tokyo , Komaba, Meguro-ku, Tokyo 153-8904, Japan
E Solano: Department of Physical Chemistry, University of the Basque Country UPV/EHU , Apartado 644, E-48080, Bilbao, Spain; IKERBASQUE, Basque Foundation for Science, E-48011 Bilbao, Spain
F Deppe: Walther-Meißner-Institut , Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany; Physik-Department, Technische Universität München , D-85748 Garching, Germany
A Marx: Walther-Meißner-Institut , Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany
R Gross: Walther-Meißner-Institut , Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany; Physik-Department, Technische Universität München , D-85748 Garching, Germany

DOI: https://doi.org/10.1088/1367-2630/15/12/125013
Journal volume & issue: Vol. 15, no. 12
p. 125013

Abstract

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Josephson parametric amplifiers (JPA) are promising devices for applications in circuit quantum electrodynamics and for studies on propagating quantum microwaves because of their good noise performance. In this work, we present a systematic characterization of a flux-driven JPA at millikelvin temperatures. In particular, we study in detail its squeezing properties by two different detection techniques. With the homodyne setup, we observe the squeezing of vacuum fluctuations by superposing signal and idler bands. For a quantitative analysis, we apply dual-path cross-correlation techniques to reconstruct the Wigner functions of various squeezed vacuum and thermal states. At 10 dB signal gain, we find 4.9 ± 0.2 dB squeezing below the vacuum. In addition, we discuss the physics behind squeezed coherent microwave fields. Finally, we analyze the JPA noise temperature in the degenerate mode and find a value smaller than the standard quantum limit for phase-insensitive amplifiers.

Published in New Journal of Physics

ISSN: 1367-2630 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Physics
Website: https://iopscience.iop.org/journal/1367-2630

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