A team of researchers with members from Universit´e Paris-Saclay, the University of Ulm and the Institute of Quantum Technologies has developed an on-chip circuit that produces up to six microwave photons at the same time. In their paper published in the journal Physical Review X, the group describes how they built the device, how well it worked, and its possible use as a more efficient way to produce entangled particles.
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Source: Phys.org