Planck spectroscopy and quantum noise of microwave beam splitters

M. Mariantoni; E. P. Menzel; F. Deppe; M. Á Araque Caballero; A. Baust; T. Niemczyk; E. Hoffmann; E. Solano; A. Marx; R. Gross

doi:10.1103/PhysRevLett.105.133601

Planck spectroscopy and quantum noise of microwave beam splitters

M. Mariantoni, E. P. Menzel, F. Deppe, M. Á Araque Caballero, A. Baust, T. Niemczyk, E. Hoffmann, E. Solano, A. Marx, R. Gross

Chair of Technical Physics

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64 Scopus citations

Abstract

We use a correlation function analysis of the field quadratures to characterize both the blackbody radiation emitted by a 50Ω 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.

Original language	English
Article number	133601
Journal	Physical Review Letters
Volume	105
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevLett.105.133601
State	Published - 20 Sep 2010

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10.1103/PhysRevLett.105.133601

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AU - Menzel, E. P.

AU - Deppe, F.

AU - Araque Caballero, M. Á

AU - Baust, A.

AU - Niemczyk, T.

AU - Hoffmann, E.

AU - Solano, E.

AU - Marx, A.

AU - Gross, R.

PY - 2010/9/20

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AB - We use a correlation function analysis of the field quadratures to characterize both the blackbody radiation emitted by a 50Ω 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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Planck spectroscopy and quantum noise of microwave beam splitters

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