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The quantum nature of photonic systems is reflected in the photon statisticsof the light they emit. Therefore, the development of quantum optics tools withsingle photon sensitivity and excellent temporal resolution is paramount to thedevelopment of exotic sources, and is particularly challenging in the THz rangewhere photon energies approach kbT at T=300 K. Here, we report on the firstroom temperature measurement of field g1({\tau}) and intensity correlationsg2({\tau}) in the THz range with sub-cycle temporal resolution (146 fs) overthe bandwidth 0.3-3 THz, based on electro-optic sampling. With this system, weare able to measure the photon statistics at threshold of a THz Quantum CascadeLaser.

Measuring intensity correlations of a THz quantum cascade laser around its threshold at sub-cycle timescales