Nonlinear quantum state transformation of spin-1/2
Quantum Physics
2009-10-30 v1
Abstract
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.
Cite
@article{arxiv.quant-ph/9708040,
title = {Nonlinear quantum state transformation of spin-1/2},
author = {H. Bechmann-Pasquinucci and B. Huttner and N. Gisin},
journal= {arXiv preprint arXiv:quant-ph/9708040},
year = {2009}
}
Comments
12 pages, LaTeX, amssym, epsfig (2 figures included)