A single microwave photon in a superposition of two states of different frequency is now demonstrated using a superconducting quantum interference device to mediate the coupling between two harmonics of a resonator. Such quantum circuits bring closer the possibility of controlling photon–photon interactions at the single-photon level.
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Billangeon, PM., Nakamura, Y. Quantum cups and balls. Nature Phys 7, 594–595 (2011). https://doi.org/10.1038/nphys2062
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DOI: https://doi.org/10.1038/nphys2062
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