PT-symmetric quantum state discrimination
Suppose that a system is known to be in one of two quantum states, $|ψ_1 > $ or $|ψ_2 >$. If these states are not orthogonal, then in conventional quantum mechanics it is impossible with one measurement to determine with certainty which state the system is in. However, because a non-Hermitian PT-symmetric Hamiltonian determines the inner product that is appropriate for the Hilbert space of physical states, it is always possible to choose this inner product so that the two states $|ψ_1 > $ and $|ψ_2 > $ are orthogonal. Thus, quantum state discrimination can, in principle, be achieved with a single measurement.
hep-th↗