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A team of researchers at the Centre de Nanosciences et de Nanotechnologies (C2N, CNRS/Univ. Paris-Saclay) has experimentally achieved the coherent propagation of electrons in circuits over macroscopic distances through a novel nano-engineering strategy.

The of electronic quasiparticles underpins many of the emerging transport properties of conductors at small scales. Novel electronic implementations of quantum optics devices are now available with perspectives such as 'flying' qubit manipulations. However, electronic quantum interference in conductors (quantum coherence length) has been limited to propagation paths shorter than 30 μm, independently of the material, geometry and experimental conditions. Remarkably similar maximum values were obtained in ballistic semi-conductors, diffusive metals and 2-D materials like graphene.

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Category: Science