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quant-ph2026
A threshold for maximal Schmidt number from spectrum
Junhyeong An, Soojoon Lee
The Schmidt number quantifies the dimensionality of entanglement in bipartite quantum states. We investigate when the spectrum of a state on alo…
quant-ph2026
Beyond the Positive Partial Transpose Squared Conjecture: The Qutrit Case
Junhyeong An, Soojoon Lee
Entanglement swapping is a fundamental operation in quantum repeaters for establishing entanglement between distant parties. The positive partial transpose (PPT) squared conjecture…
physics.optics2026
Opposite amplitude phase entropy responses at a non Hermitian avoided crossing
Kyu-Won Park, Soojoon Lee, Kabgyun Jeong
Avoided crossings (A.C.) in open resonators arise from non-Hermitian mode interaction, where leakage produces complex spectra and biorthogonal eigenmodes. Intensity-based entropies…