Planck Spectroscopy and the Quantum Noise of Microwave Beam Splitters
arXiv:1003.3194 · doi:10.1103/PhysRevLett.105.133601
Abstract
We use a correlation function analysis of the field quadratures to characterize both the black body radiation emitted by a 50 Ohm 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.
5 pages, 4 figures
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