Photon-bunching measurement after 2x25km of standard optical fibers

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dc.creatorHalder, M.
dc.creatorTanzilli, S.
dc.creatorde Riedmatten, H.
dc.creatorBeveratos, A.
dc.creatorZbinden, H.
dc.creatorGisin, N.
dc.date2004-08-13
dc.date2005-03-18
dc.date.accessioned2026-07-07T08:25:06Z
dc.date.available2026-07-07T08:25:06Z
dc.descriptionTo show the feasibility of a long distance partial Bell-State measurement, a Hong-Ou-Mandel experiment with coherent photons is reported. Pairs of degenerate photons at telecom wavelength are created by parametric down conversion in a periodically poled lithium niobate waveguide. The photon pairs are separated in a beam-splitter and transmitted via two fibers of 25km. The wave-packets are relatively delayed and recombined on a second beam-splitter, forming a large Mach-Zehnder interferometer. Coincidence counts between the photons at the two output modes are registered. The main challenge consists in the trade-off between low count rates due to narrow filtering and length fluctuations of the 25km long arms during the measurement. For balanced paths a Hong-Ou-Mandel dip with a visibility of 47.3% is observed, which is close to the maximal theoretical value of 50% developed here. This proves the practicability of a long distance Bell state measurement with two independent sources, as e.g. required in an entanglement swapping configuration in the scale of tens of km.
dc.description6 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/quant-ph/0408092
dc.identifierhttp://arxiv.org/abs/quant-ph/0408092
dc.identifierPhys. Rev. A 71, 042335 (2005)
dc.identifierdoi:10.1103/PhysRevA.71.042335
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/136557
dc.subjectQuantum Physics
dc.titlePhoton-bunching measurement after 2x25km of standard optical fibers
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