I care about #BosonSampling, this is why I need a) indistinguishable pairs of photons and b) a network of tunable beamsplitters (aka Mach–Zehnder interferometers).
One key method to produce these photon pairs, is through spontaneous parametric down-conversion (SPDC) in nonlinear crystals.
One key method to get a network of tunable beamsplitters is to team up with a company that makes just that (may I introduce #QuiXquantum https://www.quixquantum.com/).