Methods for linear optical quantum Fredkin gate

Details Methods for linear optical quantum Fredkin gate Methods for linear optical quantum Fredkin gate

2008-04-07

arxiv.org/abs/0804.0992v1

Phys. Rev. A 78, 012305 (2008)

Physics

Quantum Physics

5 pages, 5 figures

Scientific paper

10.1103/PhysRevA.78.012305

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.

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