The first system that can produce atom–photon entangled pairs on demand has been built by physicists in the US. The set-up uses a 1D optical lattice of ultracold atoms to emit a single photon. However, unlike previous experiments, in which the quantum state of the atoms is destroyed immediately after photon emission, the atomic state endures and is entangled with the photon. Another important feature of the system is that it is deterministic, producing entangled states on demand. Together, these properties could be exploited to create networks for processing and distributing quantum information.
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