Methods for linear optical quantum Fredkin gate

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We consider the realization of quantum Fredkin gate with only linear optics and single photons. First we construct a heralded Fredkin gate using four heralded controlled-not (CNOT) gates. Then we simplify this method to a post-selected one utilizing only two CNOT gates. We also give a possible realization of this method which is feasible with current experimental technology. Another post-selected scheme requires time entanglement of the input photons but needs no ancillary photons.
5 pages, 5 figures

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Quantum Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/164040

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0804.0992
 http://arxiv.org/abs/0804.0992
 Phys. Rev. A 78, 012305 (2008)
 doi:10.1103/PhysRevA.78.012305

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arXiv