Demonstration of a programmable source of two-photon multiqubit entangled states

Details Demonstration of a programmable source of two-photon multiqubit entangled states Demonstration of a programmable source of two-photon multiqubit entangled states

2009-12-15

arxiv.org/abs/0912.2975v4

Phys. Rev. A 81, 042322 (2010)

Physics

Quantum Physics

5 pages, 4 figures, to appear on PRA

Scientific paper

We suggest and demonstrate a novel source of two-photon multipartite entangled states which exploits the transverse spatial structure of spontaneous parametric downconversion together with a programmable spatial light modulator (SLM). The 1D SLM is used to perform polarization entanglement purification and to realize arbitrary phase-gates between polarization and momentum degrees of freedom of photons. We experimentally demonstrate our scheme by generating two-photon three qubit linear cluster states with high fidelity using a diode laser pump with a limited coherence time and power on the crystal as low as 2.5$mW.

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