Non-Hermitian systems with gain and loss give rise to exceptional points with exceptional properties. An experiment with superconducting qubits now offers a first step towards studying these singularities in the quantum domain.
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Rotter, S. Exceptional quantum behaviour. Nat. Phys. 15, 1214–1215 (2019). https://doi.org/10.1038/s41567-019-0657-7