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| A silicon microresonator (left, SEM image) provides a parametric broadband source for frequency-entangled photon pairs 21 GHz apart to achieve frequency-encoded large-scale quantum networks. The result is a trusted-node-free, fully-connected network where users are linked by a two-qubit frequency-entangled state Credit: Henry et al., doi 10.1117/1.AP.6.3.036003. |
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