Qubits cannot exist without nonlinearity, but nonlinear elements in superconducting circuits lead to losses. A superconducting qubit has now been realized by nonlinearly coupling two microwave resonators, offering the promise of long coherence times.
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Kirchmair, G. Designing nonlinearity. Nat. Phys. 16, 127–128 (2020). https://doi.org/10.1038/s41567-019-0710-6
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DOI: https://doi.org/10.1038/s41567-019-0710-6