Ultra-miniaturized non-classical light sources for quantum device

https://phys.org/news/2023-04-ultra-miniaturized-non-classical-sources-quantum-devices.html

"20 µm non-classical light sources... quantum resonators that generate non-classical states of light, like the microring and photonic crystal cavity... efficient parametric conversion using low pump power (≈ 40 µW)... emits correlated photons, and quadrature-squeezed vacuum below... emits correlated beams coherent light.. canonical resonant 4-Wave-Mixing... 3 geometries PhC multimode resonators... photonic crystal 200 nm layer In0.5Ga0.5P 2D hole pattern...  uncorrelated fluctuations modes of same resonator"

Related: Counting photons for quantum computing

https://phys.org/news/2023-04-photons-quantum.html