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 …

Hydrogenic Spin-Valley states in Bromine-doped 2H-MoTe2

In semiconductors, the identification of doping atomic elements allowing to encode a qubit within spin states is of intense interest for quantum technologies. In zinc-blende semiconductors, the large spin-orbit coupling leads to spin mixing and loss of spin coherence. In contrast, in 2H-transition metal dichalcogenides (TMDCs), the combination of strong spin-orbit coupling and multiple valleys in the band structure provides protection against relaxation and decoherence. Indeed, due to …