Both superconducting and semiconducting systems are the focus of intense ongoing research and development as platforms for quantum-information hardware. At the same time, superconducting-semiconducting hybrid quantum systems are attracting considerable attention, since they can combine interesting physical properties of both material classes and can sometimes exhibit entirely new properties. Now, a group led by Lieven Vandersypen at Delft University of Technology in the Netherlands has succeeded in coherently coupling two electron spins in separate semiconductor nanostructures via the exchange of virtual photons through a superconducting microwave resonator [1]. Their demonstration marks a milestone in semiconductor spin-qubit research and offers new possibilities for spin-based quantum computing.
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