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Eternal life of entropy in non-Hermitian quantum systems by Fring, Andreas; Frith, Thomas is a scholarly article available to read on EtoBox.

What is Eternal life of entropy in non-Hermitian quantum systems about?

We find a new effect for the behaviour of Von Neumann entropy. For this we derive the framework for describing Von Neumann entropy in non-Hermitian quantum systems and then apply it to a simple interacting PT symmetric bosonic system. We show that our model is well defined even in the PT broken regime with the introduction of a time-dependent metric and that it displays three distinct behaviours relating to the PT symmetry of the original time-independent Hamiltonian. When the symmetry is unbroken, the entropy undergoes rapid decay to zero (so-called "sudden death") with a subsequent revival. At the exceptional point it decays asymptotically to zero and when the symmetry is spontaneously broken it decays asymptotically to a finite constant value ("eternal life").

Author

Fring, Andreas; Frith, Thomas

Published

2019

Language

EN