Multimode generation of quantum correlated photons using a crystal

The ability to distribute entanglement over long distances could be a key-enabling technology that will allow the large-scale deployment of quantum technologies. In our recent article published in Physical Review Letter and featured in Physics, we demonstrated an important step towards implementing a quantum repeater. Using our Europium doped crystal we produced streams of biphotons with one of the photon delayed up to 1 ms. This work shows that rare-earth crystals can be used to generate long-lived quantum correlations between spins and single photons, with a unique ability of temporal multiplexing that is important for increasing the speed of future quantum repeaters.

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