Observation of two-mode squeezing in the microwave frequency domain.
- Eichler C Department of Physics, ETH Zürich, CH-8093, Zürich, Switzerland.
- Bozyigit D
- Lang C
- Baur M
- Steffen L
- Fink JM
- Filipp S
- Wallraff A
- 2011-10-27
Published in:
- Physical review letters. - 2011
English
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.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1103/PhysRevLett.107.113601
- PMID 22026665
- Persistent URL
- https://sonar.ch/global/documents/292930
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