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Optimal local expansion of W states using linear optics and Fock states

We derive the maximum success probability of the circuits with passive linear optics for expanding an N-photon W state to an (N + n)-photon W state, by accessing only one photon of the initial W state and adding n photons in a Fock state. We show that the maximum success probability is achieved by a polarization-dependent beamsplitter and n-1 polarization-independent beamsplitters.

preprint2011arXivOpen access
Rikizo IkutaToshiyuki TashimaTakashi YamamotoMasato KoashiNobuyuki Imoto
quant-ph
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Rikizo IkutaToshiyuki TashimaTakashi YamamotoMasato KoashiNobuyuki Imoto

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