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sciencejournalist00
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The green dots represent photons in an anti-bunched state, squeezed light.
The red dots represent photons in a semi-bunched state, laser light
The blue dots represent photons in a bunched state, thermal light
The complex setups used in entanglement experiments only squeeze light in amplitude, phase, photon number and filter out squeezed light from classical light before the beam splitter can perform entanglement.
But if you are lucky, you just need two sources of squeezed light, which are usually non-linear crystals but single-photon sources will do too. Maybe in the future they will discover more ways to produce anti-bunched photons.
You also need the photons from the two input beams to be indistinguishable in polarization, frequency, arrival time. Unless you want to use an artificial device that removes these properties composed of two special detectors (not any detector!) that can erase which-path information and a phase shifter.
Do not try to contradict me this time because I have taken nothing out of context, I just found a published thesis which says the conditions for the input light to be entangled by a beam splitter
Given that laser light is a mixture of classical light and squeezed light, a beam splitter could create entanglement with a very small probability, but to increase the probability of entanglement by a large factor, you have to use purely squeezed light