Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.123902
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Funding
- US National Security Agency through the U.S. Army Research Office [W911NF-05-01-0365]
- W. M. Keck Foundation
- U.S. National Science Foundation [DMR-0653377]
- CNR-Istituto di Cibernetica
- College de France
- French Agence Nationale de la Recherche
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In this Letter, we report the observation of the correlation between two modes of microwave radiation resulting from the amplification of quantum noise by the Josephson parametric converter. This process, seen from the pump, can be viewed as parametric down-conversion. The correlation is measured by an interference experiment displaying a contrast better than 99% with a number of photons per mode greater than 250 000. Dispersive measurements of mesoscopic systems and quantum encryption can benefit from this development.
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