Discrimination between evolution operators

Details Discrimination between evolution operators Discrimination between evolution operators

2007-10-18

arxiv.org/abs/0710.3581v1

Phys. Rev. A 76, 042322 (2007)

Physics

Quantum Physics

7 pages, 2 figures, REVTeX

Scientific paper

10.1103/PhysRevA.76.042322

Under broad conditions, evolutions due to two different Hamiltonians are shown to lead at some moment to orthogonal states. For two spin-1/2 systems subject to precession by different magnetic fields the achievement of orthogonalization is demonstrated for every scenario but a special one. This discrimination between evolutions is experimentally much simpler than procedures proposed earlier based on either sequential or parallel application of the unknown unitaries. A lower bound for the orthogonalization time is proposed in terms of the properties of the two Hamiltonians.

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