Mid-infrared coincidence measurements on twin photons at room temperature

M. Mancinelli, A. Trenti (), S. Piccione, G. Fontana, J. S. Dam, P. Tidemand-Lichtenberg, C. Pedersen and L. Pavesi
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M. Mancinelli: Nanoscience Laboratory, University of Trento
A. Trenti: Nanoscience Laboratory, University of Trento
S. Piccione: Nanoscience Laboratory, University of Trento
G. Fontana: Nanoscience Laboratory, University of Trento
J. S. Dam: DTU Fotonik, Technical University of Denmark
P. Tidemand-Lichtenberg: DTU Fotonik, Technical University of Denmark
C. Pedersen: DTU Fotonik, Technical University of Denmark
L. Pavesi: Nanoscience Laboratory, University of Trento

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract 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.

Date: 2017
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DOI: 10.1038/ncomms15184

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