Observation of two-mode squeezing in the microwave frequency domain.
Phys Rev Lett
; 107(11): 113601, 2011 Sep 09.
Article
em En
| MEDLINE
| ID: mdl-22026665
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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Phys Rev Lett
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2011
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