Demonstration of local expansion toward large-scale entangled webs

Details Demonstration of local expansion toward large-scale entangled webs Demonstration of local expansion toward large-scale entangled webs

2010-09-16

arxiv.org/abs/1009.3086v2

Phys. Rev. Lett. 105, 210503 (2010) [4 pages]

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

We demonstrate an optical gate that increases the size of polarization-based W states by accessing only one of the qubits. Using this gate, we have generated three-photon and four-photon W states with fidelities $0.836\pm 0.042 $ and $0.784\pm 0.028$, respectively. We also confirmed existence of pairwise entanglement in every pair of the qubits including the one that was left untouched by the gate. The gate is applicable to any size of W states and hence is a universal tool for expanding entanglement.

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