Abstract
In this paper, the generation of polarization entangled photon pairs at 1.5 μm is experimentally demonstrated utilizing a polarization maintaining all-fiber loop, consisting of a piece of commercial polarization maintaining fiber and a polarization beam splitter/combiner with polarization maintaining fiber pigtails. The polarization entangled two photon state of 1/√2(|H s⟩|H i⟩ + e iϕ|V s⟩|V i⟩) can be generated while the relative phase ϕ can be adjusted by manipulating the polarization state of the pump light. A quantum state tomography measurement is performed to analyze the entanglement characteristic of the generated quantum state. In the experiment, the polarization entangled Bell state |Φ +⟩ is generated with an entanglement fidelity of 0.97 ± 0.03 and a purity of 0.94 ± 0.03 demonstrating that the proposed scheme can realize polarization entangled photon pair generation with polarization maintaining property which is desired in applications of quantum communication and quantum information.
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Zhou, Q., Zhang, W., Niu, Tz. et al. A polarization maintaining scheme for 1.5 μm polarization entangled photon pair generation in optical fibers. Eur. Phys. J. D 67, 202 (2013). https://doi.org/10.1140/epjd/e2013-40102-x
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DOI: https://doi.org/10.1140/epjd/e2013-40102-x