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It is a difficult engineering task to create distinct solid state singlephoton sources which nonetheless emit photons at the same frequency. It is alsohard to create entangled photon pairs from quantum dots. In the spirit ofquantum engineering we propose a simple optical circuit which can, in the rightcircumstances, make frequency distinguishable photons frequencyindistinguishable. Our circuit can supply a downstream solution to bothproblems, opening up a large window of allowed frequency mismatches betweenphysical mechanisms. The only components used are spectrum analysers/prisms andan Acousto-Optic Modulator. We also note that an Acousto-Optic Modulator can beused to obtain Hong-Ou-Mandel two photon interference effects from thefrequency distinguishable photons generated by distinct sources.Comment: 4 pages, 4 figure

Photon frequency-mode matching using acousto-optic frequency beam splitters