4 years ago

Mid-infrared coincidence measurements on twin photons at room temperature

Mid-infrared coincidence measurements on twin photons at room temperature
M. Mancinelli, A. Trenti, J. S. Dam, L. Pavesi, G. Fontana, C. Pedersen, P. Tidemand-Lichtenberg, S. Piccione
Quantum measurements using single-photon detectors are opening interesting new perspectives in diverse fields such as remote sensing, quantum cryptography and quantum computing. A particularly demanding class of applications relies on the simultaneous detection of correlated single photons. In the visible and near infrared wavelength ranges suitable single-photon detectors do exist. However, low detector quantum efficiency or excessive noise has hampered their mid-infrared (MIR) counterpart. Fast and highly efficient single-photon detectors are thus highly sought after for MIR applications. Here we pave the way to quantum measurements in the MIR by the demonstration of a room temperature coincidence measurement with non-degenerate twin photons at about 3.1 μm. The experiment is based on the spectral translation of MIR radiation into the visible region, by means of efficient up-converter modules. The up-converted pairs are then detected with low-noise silicon avalanche photodiodes without the need for cryogenic cooling.

Publisher URL: http://www.nature.com/articles/ncomms15184

DOI: 10.1038/ncomms15184

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