Two photon interference experiment

The basic experiment for a photonic quantum computer.

Can be achieved in two ways it seems:

macroscopic beam splitter and optical table
photolithography

Animation of Hong-Ou-Mandel Effect on a silicon like structure by Quantum Light University of Sheffield (2014): www.youtube.com/watch?v=ld2r2IMt4vg No maths, but gives the result clear: the photons are always on the same side.

Video 11. Quantum Computing with Light by Quantum Light University of Sheffield (2015) Source. Animation of in-silicon single photon device with brief description of emitting and receiving elements. Mentions:

quantum dot source. TODO how do you produce identical photons from two separate quantum dots? See also: quantum dot single photon source.
superconducting nanowire detector. So the device has to be cooled then? Video "Jeremy O'Brien: "Quantum Technologies" by GoogleTechTalks (2014)" youtube.com/watch?v=7wCBkAQYBZA&t=2497 however says that semiconducting devices can also be used

Video 12. Quantum Optics - Beam splitter in quantum optics by Alain Aspect (2017) Source. More theoretical approach.

Video 13. Building a Quantum Computer Out of Light by whentheappledrops (2014) Source. Yada yada yada, then at youtu.be/ofg335d3BJ8?t=341 shows optical table and it starts being worth it. Jacques Carolan from the University of Bristol goes through their setup which injects 5 photons into a 21-way experiment.

Two photon interference experiment

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