An elementary optical gate for expanding entanglement web

Details An elementary optical gate for expanding entanglement web An elementary optical gate for expanding entanglement web

2008-03-13

arxiv.org/abs/0803.1897v1

Phys. Rev. A 77, 030302(R) (2008)

Physics

Quantum Physics

5 pages, 2 figures. To appear in Phys. Rev. A

Scientific paper

We introduce an elementary optical gate for expanding polarization entangled W states, in which every pair of photons are entangled alike. The gate is composed of a pair of 50:50 beamsplitters and ancillary photons in the two-photon Fock state. By seeding one of the photons in an $n$-photon W state into this gate, we obtain an $(n+2)$-photon W state after post-selection. This gate gives a better efficiency and a simpler implementation than previous proposals for $\rm W$-state preparation.

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