Physics – Quantum Physics
Scientific paper
2008-01-24
Phys. Rev. Lett. 102, 160502 (2009)
Physics
Quantum Physics
4 pages, 3 figures, comments welcome. Revised version includes multi-partite QPD
Scientific paper
Discrimination between unknown processes chosen from a finite set is experimentally shown to be possible even in the case of non-orthogonal processes. We demonstrate unambiguous deterministic quantum process discrimination (QPD) of non-orthogonal processes using properties of entanglement, additional known unitaries, or higher dimensional systems. Single qubit measurement and unitary processes and multipartite unitaries (where the unitary acts non-separably across two distant locations) acting on photons are discriminated with a confidence of $\geq97%$ in all cases.
Laing Anthony
O'Brien Jeremy L.
Rudolph Terry
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