Twin Photons From Unequal Sources?

…Many technologies that make use of quantum effects are based on exactly equal photons…

…Producing such photons, however, is extremely difficult. Not only do they need to have precisely the same wavelength (colour), but their shape and polarization also have to match…

…A team of researchers led by Richard Warburton at the University of Basel, in collaboration with colleagues at the University of Bochum, has now succeeded in creating identical photons originating from different and widely-separated sources…

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