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quant-ph2026
Fundamental Limits of Non-Hermitian Sensing from Quantum Fisher Information
Jan Wiersig, Stefan Rotter
Exceptional points (EPs) exhibit strongly enhanced spectral responses and are therefore promising candidates for sensing applications. Whether these non-Hermitian degeneracies prov…
quant-ph2025
Higher-order exceptional points in composite non-Hermitian systems
Jan Wiersig, Weijian Chen
We show that a composite quantum system described by the tensor product of multiple systems each with a leading-order exceptional point (a non-Hermitian degeneracy at which not onl…