Physicists have been trying to use quantum mechanics for decades to build computers that could solve problems currently out of reach of classical machines. Options are many, including superconducting circuits, trapped ions, and semiconductor quantum dots. But now researchers are looking to a more unconventional candidate: electrons near the surface of superfluid helium.
Once seen as a physically quirky system, this is now emerging as a viable, scalable platform for charge- and spin-based quantum computing. Recently, Physics demonstrated that these electrons can strongly couple to microwave photons, enabling extremely precise quantum measurement and control. In more detail, the researchers achieved strong coupling between a microwave photon and the motional state of a single electron in superfluid helium.
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