Long-distance entanglement swapping with photons from separated sources

被引：147

作者：

de Riedmatten, H ^{[1
]}

Marcikic, I ^{[1
]}

van Houwelingen, JAW ^{[1
]}

Tittel, W ^{[1
]}

Zbinden, H ^{[1
]}

Gisin, N ^{[1
]}

机构：

[1] Univ Geneva, Appl Phys Grp, Geneva, Switzerland

来源：

PHYSICAL REVIEW A | 2005年 / 71卷 / 05期

关键词：

D O I：

10.1103/PhysRevA.71.050302

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report the experimental realization of entanglement swapping over long distances in optical fibers. Two photons separated by more than 2 km of optical fibers are entangled, although they never directly interacted. We use two pairs of time-bin entangled qubits created in spatially separated sources and carried by photons at telecommunication wavelengths. A partial Bell-state measurement is performed with one photon from each pair, which projects the two remaining photons, formerly independent onto an entangled state. A visibility high enough to infer a violation of a Bell inequality is reported, after both photons have each traveled through 1.1 km of optical fiber.

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