  The dynamics of an open quantum system with balanced gain and loss is not
described by a PT-symmetric Hamiltonian but rather by Lindblad operators.
Nevertheless the phenomenon of PT-symmetry breaking and the impact of
exceptional points can be observed in the Lindbladean dynamics. Here we briefly
review the development of PT symmetry in quantum mechanics, and the
characterisation of PT-symmetry breaking in open quantum systems in terms of
the behaviour of the speed of evolution of the state.
