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quant-ph2001
Comment on "Experimental observation of the topological structure of exceptional points" [Phys.Rev.Lett. 86, 787 (2001]
I. Rotter
It is shown that the two experiments Dembowski et al., PRL 86, 787 (2001), and Lauber et al., PRL 72, 1004 (1994), prove the same topological singularity. The phase changes found i…
quant-ph2000
Branch points in the complex plane and information loss in quantum systems at high level density
I. Rotter
The mechanism of avoided level crossings in quantum systems is studied. It is traced back to the existence of branch points in the complex plane which influence the properties of r…