Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.133601
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Funding
- German Research Foundation [SFB 631]
- German Excellence Initiative via NIM, Basque Government [IT472-10]
- Spanish MICINN [FIS2009-12773-C02-01]
- SOLID European project
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We use a correlation function analysis of the field quadratures to characterize both the blackbody radiation emitted by a 50 Omega load resistor and the quantum properties of two types of beam splitters in the microwave regime. To this end, we first study vacuum fluctuations as a function of frequency in a Planck spectroscopy experiment and then measure the covariance matrix of weak thermal states. Our results provide direct experimental evidence that vacuum fluctuations represent the fundamental minimum quantum noise added by a beam splitter to any given input signal.
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