In my talk I will present results from two recent projects centered around non-Hermitian physics and PT-symmetry. In the first project we managed to show that the line-width of a phonon laser broadens significantly when approaching a so-called "exceptional point" . In the second project we implemented our theoretical prediction on scattering states in disordered media with constant intensity and perfect transmission  in an acoustic setup. Using several loudspeakers with gain and loss allows us to steer an incoming sound wave across a strongly disordered waveguide without any reflection or variation in its pressure .
 Zhang, Peng, Özdemir, Pichler, Krimer, Zhao, Nori, Liu, Rotter, Yang, Nature Photonics, 12, 479 (2018).
 Makris, Brandstötter, Ambichl, Musslimani, Rotter, Light Sci. Appl. 6, e17035 (2017).
 Rivet, Brandstötter, Makris, Lissek, Rotter, Fleury, arXiv:1804.02363 (Nature Physics, in print).
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