Drop-in compatible entanglement for optical-fiber networks

Matthew A. Hall, Joseph B. Altepeter, Prem Kumar

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


A growing number of quantum communication protocols require entanglement distribution among remote parties, which is best accomplished by exploiting the mature technology and extensive infrastructure of low-loss optical fiber. For this reason, a practical source of entangled photons must be drop-in compatible with optical fiber networks. Here we demonstrate such a source for the first time, in which the nonlinearity of standard singlemode fiber is utilized to yield entangled photon pairs in the 1310-nm Oband. Using an ultra-stable design, we produce polarization entanglement with 98.0% ± 0.5% fidelity to a maximally entangled state as characterized via coincidence-basis tomography. To demonstrate the source's drop-in capability, we transmit one photon from each entangled pair through a telecommunications-grade optical amplifier set to boost classical 1550-nm (C-band) communication signals. We verify that the photon pairs experience no measurable decoherence upon passing through the active amplifier (the output state's fidelity with a maximally entangled state is 98.4% ± 1.4%).

Original languageEnglish (US)
Pages (from-to)14558-14566
Number of pages9
JournalOptics Express
Issue number17
StatePublished - Aug 17 2009

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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