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Planck Spectroscopy and the Quantum Noise of Microwave Beam Splitters

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arxiv 1003.3194 v1 pith:CQP54KBR submitted 2010-03-16 cond-mat.mes-hall cond-mat.supr-conquant-ph

Planck Spectroscopy and the Quantum Noise of Microwave Beam Splitters

M. Mariantoni , E. P. Menzel , F. Deppe , M. A. Araque Caballero , A. Baust , T. Niemczyk , E. Hoffmann , E. Solano
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A. Marx R. Gross
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classification cond-mat.mes-hall cond-mat.supr-conquant-ph
keywords beamquantumfluctuationsfunctionmicrowavenoiseplanckspectroscopy
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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.

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