Critical component for quantum technologies miniaturized: Entangled photon pairs produced with high efficiency, on 160 nm nonlinear platforms

https://www.eurekalert.org/news-releases/1107103

"qubit sources often room-size, overcome with scalable, on-chip quantum processors, enabled by using metasurfaces: artificial geometries etched, using standard cleanroom technology, into ultrathin molybdenum disulfide crystals... enhances nonlinear effects more than traditional linear optical optimization techniques... nearly 150X 2nd-harmonic improvement compared to unpatterned samples... future: reverse this process splitting 1 photon into 2 entangled photons (basis for qubits)... easily integrated with existing fiber-optics"