Distinguishing n Hamiltonians on C^n by a single measurement

Dominik Janzing, Thomas Beth

Published 2001-03-06Version 1

If an experimentalist wants to decide which one of n possible Hamiltonians acting on an n dimensional Hilbert space is present, he can conjugate the time evolution by an appropriate sequence of known unitary transformations in such a way that the different Hamiltonians result in mutual orthogonal final states. We present a general scheme providing such a sequence.