The groundbreaking paper from Miri and Alù, apart from the mentioned fields of quantum resonance, optics and photonics, paves also the way for fully-novel applications of non-Hermitian systems’ singularities. Indeed, non-Hermitian systems have been recently assessed in biological and neural networks too (1,2). In particular, the brain exhibits the ingredients required by Miri and Alù’s framework:
Therefore, the insights provided by Miri et Alù might lead to fruitful applications not just in the fields of coupled-cavity laser sources, sensors, absorbers, nonlinear resonators, spatial mode converters and isolators, but also in revising fundamental concepts in nonconservative BIOLOGICAL systems, such as the human brain.
3) B. Haider, A. Duque, A.R. Hasenstaub, D.A. McCormick, 2006. Neocortical network activity in vivo is generated through a dynamic balance of excitation and inhibition. J. Neurosci. 26, 4535-45. doi: 10.1523/JNEUROSCI.5297-05.2006.
7) L. Marzetti, C. Del Gratta, G. Nolte, 2008. Understanding brain connectivity from EEG data by identifying systems composed of interacting sources. Neuroimage 42, 87-98 (2008). doi: 10.1016/j.neuroimage.2008.04.250.
Tozzi A. 2019. RE: towards applications for exceptional points also in non- hermitian biological networks. (electronic response to: Miri M-A, Alù A. 2019. Exceptional points in optics and photonics. Science, 363 (6422), eaar7709.