An efficient quantum filter for multiphoton states
arXiv:quant-ph/0406008 · doi:10.1080/09500340512331323493
Abstract
We propose a scheme for implementing a multipartite quantum filter that uses entangled photons as a resource. It is shown that the success probability for the 2-photon parity filter can be as high as 1/2, which is the highest that has so far been predicted without the help of universal two-qubit quantum gates. Furthermore, the required number of ancilla photons is the least of all current parity filter proposals. Remarkably, the quantum filter operates with probability 1/2 even in the N-photon case, irregardless of the number of photons in the input state.
8 pages, 2 figures, revised version, accepted for publication in J. Mod. Opt
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