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Terahertz quantum optics in the time-domain: from field correlation measurements on vacuum field fluctuations in free space towards cavity electro-optics

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Abstract

The ground state of electromagnetic radiation is characterised by a fluctuating electromagnetic field even in a vacuum. We measure its correlation function as a function of time and space using the electro-optic effect. We determine the spectral content and the amplitude of this state and find excellent agreement with the second quatisation theory.

© 2020 The Author(s)

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