Quantum mechanics using whole electrical circuits might seem a far-fetched idea. But make the circuits superconducting, and they can be used to send and collect single photons, rather like atoms do — only better.
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Niskanen, A., Nakamura, Y. Qubits ride the photon bus. Nature 449, 415–417 (2007). https://doi.org/10.1038/449415a
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DOI: https://doi.org/10.1038/449415a