Observation of two-mode squeezing in the microwave frequency domain

Continuous variable entanglement between two modes of a radiation field is usually studied at optical frequencies. Here we demonstrate experiments that show the entanglement between microwave photons of different energy in a broadband squeezed beam. We use a Josephson parametric amplifier to generat...

Full description

Saved in:
Bibliographic Details
Published inPhysical review letters Vol. 107; no. 11; p. 113601
Main Authors Eichler, C, Bozyigit, D, Lang, C, Baur, M, Steffen, L, Fink, J M, Filipp, S, Wallraff, A
Format Journal Article
LanguageEnglish
Published United States 06.09.2011
Online AccessGet more information

Cover

More Information
Summary:Continuous variable entanglement between two modes of a radiation field is usually studied at optical frequencies. Here we demonstrate experiments that show the entanglement between microwave photons of different energy in a broadband squeezed beam. We use a Josephson parametric amplifier to generate the two-mode correlated state and detect all four quadrature components simultaneously in a two-channel heterodyne setup using amplitude detectors. Analyzing two-dimensional phase space histograms for all possible pairs of quadratures allows us to determine the full covariance matrix, which is in good agreement with the one expected for a two-mode squeezed state.
ISSN:1079-7114
DOI:10.1103/physrevlett.107.113601