Observation of Two-Mode Squeezing in the Microwave Frequency Domain

C. Eichler, D. Bozyigit, C. Lang, M. Baur, L. Steffen, J. M. Fink, S. Filipp, and A. Wallraff
Phys. Rev. Lett. 107, 113601 – Published 6 September 2011

Abstract

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.

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  • Received 24 January 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.113601

© 2011 American Physical Society

Authors & Affiliations

C. Eichler, D. Bozyigit, C. Lang, M. Baur, L. Steffen, J. M. Fink, S. Filipp, and A. Wallraff

  • Department of Physics, ETH Zürich, CH-8093, Zürich, Switzerland

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Vol. 107, Iss. 11 — 9 September 2011

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