= Two photon interference experiment
{wiki}
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): https://www.youtube.com/watch?v=ld2r2IMt4vg No maths, but gives the result clear: the photons are always on the same side.
\Video[https://youtube.com/watch?v=nyK-vhoOBpE]
{title=Quantum Computing with Light by Quantum Light University of Sheffield (2015)}
{description=
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>.
* <superconductivity>[superconducting] nanowire detector. So the device has to be cooled then? <video Jeremy O'Brien: "Quantum Technologies" by GoogleTechTalks (2014)> https://youtube.com/watch?v=7wCBkAQYBZA&t=2497 however says that semiconducting devices can also be used
}
\Video[http://youtube.com/watch?v=5Sb7-RNSsPg]
{title=Quantum Optics - Beam splitter in quantum optics by <Alain Aspect> (2017)}
{description=More theoretical approach.}
\Video[https://www.youtube.com/watch?v=ofg335d3BJ8]
{title=Building a Quantum Computer Out of Light by whentheappledrops (2014)}
{description=Yada yada yada, then at https://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.}