Phys.org February 27, 2020
By splitting one “pump photon” into two daughter photons, SPDC has had a crucial role in fundamental tests of quantum theory as well as many applications in quantum information processing. An international team of researchers (Canada, Spain, Sweden) used a flux-pumped, superconducting parametric resonator to split one microwave photon into three daughter photons. The triplet source is bright, producing a propagating photon flux comparable to ordinary two-photon SPDC. They clearly saw strong three-photon correlations in the output photons, even in the absence of normal two-photon correlations. The symmetry properties of these correlations allowed them to “fingerprint” how the photons were created, clearly demonstrating little contamination from typical SPDC processes. These results form the basis of a new paradigm of three-photon quantum optics…read more. Open Access TECHNICAL ARTICLE
Third-order correlation analysis of multimode trisqueezed states. Credit: Phys. Rev. X 10, 011011, 16 January 2020