A waveguide can steer single photons along a well-defined path, but creating the equivalent for electrons has proved tricky. Now researchers have demonstrated a potentially high-fidelity waveguide that transports single electrons in a 2D material. They used a carbon nanotube to mark out a narrow track for electrons to move across graphene, a single-atom-thick material. The device design could work in large circuit networks and could enable scientists to create new templates for quantum computing processors that use information stored in the quantum states of electrons.

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