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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 17 — Aug. 17, 2009
  • pp: 14558–14566

Drop-in compatible entanglement for optical-fiber networks

Matthew A. Hall, Joseph B. Altepeter, and Prem Kumar  »View Author Affiliations

Optics Express, Vol. 17, Issue 17, pp. 14558-14566 (2009)

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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 single-mode fiber is utilized to yield entangled photon pairs in the 1310-nm O-band. 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%).

© 2009 OSA

OCIS Codes
(060.4370) Fiber optics and optical communications : Nonlinear optics, fibers
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(270.0270) Quantum optics : Quantum optics
(270.4180) Quantum optics : Multiphoton processes
(270.5565) Quantum optics : Quantum communications

ToC Category:
Quantum Optics

Original Manuscript: June 19, 2009
Revised Manuscript: July 24, 2009
Manuscript Accepted: July 24, 2009
Published: August 3, 2009

Matthew A. Hall, Joseph B. Altepeter, and Prem Kumar, "Drop-in compatible entanglement 
for optical-fiber networks," Opt. Express 17, 14558-14566 (2009)

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