An on-chip circuit that can produce up to six microwave photons simultaneously has been created by researchers in France and Germany. Gerbold Ménard and Ambroise Peugeot at the University of Paris-Saclay and colleagues built their device by connecting a Josephson junction with a microwave resonator. While the team did not establish that the photons are entangled, previous research suggests that the device could be a source of multiple entangled photons.
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