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We show that photon quantum correlations can be measured by two photon absorption in semiconductors. Hanbury-Brown Twiss experiments can thus be performed with genuine blackbodies with a time resolution in the femtosecond range.
The second-order coherence properties of highly-incoherent cw sources (true blackbody and amplified spontaneous emission) are directly evidenced at femtosecond timescales by use of an interferometric autocorrelator based on a two-photon absorption in a GaAs phototube.
Photon bunching in highly chaotic sources (true blackbody and amplified spontaneous emission) is detected for the first time with femtosecond temporal resolution by use of a Hanbury-Brown-Twiss experiment relying on two-photon absorption in semiconductors.
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