A new path for electron optics in solid-state systems

Science Daily  July 14, 2020 Electron optics has been demonstrated mainly in one-dimensional devices, for example in nanotubes. Researchers in Switzerland have shown that the band inversion and hybridization present in two coupled semiconductor layers, consisting of InAs and GaSb system provide a novel transport mechanism that guarantees non-vanishing interference even when all angles of incidence occur. Through a combination of transport measurements and theoretical modelling, they found that their devices operate as a Fabry-Pérot interferometer in which electrons and holes form hybrid states. As the mechanism requires only band inversion and hybridization, the research opens engineering electron-optical phenomena in […]

Quantum researchers able to split one photon into three

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” […]