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Designing nonlinearity

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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Fig. 1: Superconducting qubit design.


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Correspondence to Gerhard Kirchmair.

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Kirchmair, G. Designing nonlinearity. Nat. Phys. 16, 127–128 (2020).

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