  Single-photon creation through parametric downconversion underpins quantum
technology for quantum sensing and imaging. Here we numerically study the
creation of single photons in the near- and mid-infrared regime from 1.5 - 12
um in a range of novel nonlinear semiconductor and chalcopyrite materials. We
identify phase-matching conditions and single out regimes in which
group-velocity matching can be achieved with commercially available pump
lasers. Finally, we discuss how mid-infrared single photons can be detected.
Using our numerical results, we identify materials and pump lasers for
up-conversion detection in conventional wavelength bands. Our study provides a
complete recipe for mid-IR single-photon generation and detection, opening up
quantum enhancements for mid-IR applications such as bio-medical imaging,
communication, and remote sensing.
