Space-time reveals absolute topological structures (electromagnetic Lorentz invariants)

Since the einsteinian relativistic concepts, it is considered that the idea of lines of force, introduced by Faraday in 1852, should only be considered as an illustration, which does not resist to a change of the reference frame. In his famous lectures, Feynman himself considered that the electromagnetic field should necessarily be treated in an abstract way. But this is not the case; by restricting ourselves to a situation …

Generation of entangled photons using a single spin in a solid-state artificial atom

The ability to generate many entangled photons in so-called « cluster states » is a key challenge for optical quantum technologies, with applications in quantum computing, networks and sensing. A team of researchers in C2N, in collaboration with  academic (Institut Néel, Grenoble and Universities of Leiden, Crete, Virginia Tech) and industrial (Quandela) partners, have demonstrated the deterministic generation of such states using a device based on a semiconductor quantum …