341 citations · 2.7k across the 51 of their papers we have counts for
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quant-ph2023★ 11 cited
Moving along an exceptional surface towards a higher-order exceptional point
Jan Wiersig
Open systems with non-Hermitian degeneracies called exceptional points show a significantly enhanced response to perturbations in terms of large energy splittings induced by a smal…
quant-ph2023★ 40 cited
Petermann factors and phase rigidities near exceptional points
Jan Wiersig
The Petermann factor and the phase rigidity are convenient measures for various aspects of open quantum and wave systems, such as the sensitivity of energy eigenvalues to perturbat…