Nonlinear quantum state transformation of spin-1/2

Details Nonlinear quantum state transformation of spin-1/2 Nonlinear quantum state transformation of spin-1/2

1997-08-23

arxiv.org/abs/quant-ph/9708040v1

Phys.Lett. A242 (1998) 198-204

Physics

Quantum Physics

12 pages, LaTeX, amssym, epsfig (2 figures included)

Scientific paper

10.1016/S0375-9601(98)00189-3

A non-linear quantum state transformation is presented. The transformation, which operates on pairs of spin-1/2, can be used to distinguish optimally between two non-orthogonal states. Similar transformations applied locally on each component of an entangled pair of spin-1/2 can be used to transform a mixed nonlocal state into a quasi-pure maximally entangled singlet state. In both cases the transformation makes use of the basic building block of the quantum computer, namely the quantum-XOR gate.

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