ScienceAlert: Physicists Have Found a New Method For Generating Quantum Entangle
d Photons.
[1]https://www.sciencealert.com/scientists-have-figured-out-a-new-way-to-generat
e-quantum-entangled-photons

References

   1. https://www.sciencealert.com/scientists-have-figured-out-a-new-way-to-generate-quantum-entangled-photons