Open AccessProduction of degenerate polarization entangled photon pairs in the telecom-band from a pump enhanced parametric downconversion process
Author(s) -
Peter J. Thomas,
Christopher J. Chunnilall,
David J. M. Stothard,
D. Walsh,
Malcolm H. Dunn
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.026600
Subject(s) - spontaneous parametric down conversion , physics , photon , degenerate energy levels , polarization (electrochemistry) , bell state , quantum optics , quantum entanglement , photon polarization , optics , photon entanglement , parametric statistics , quantum key distribution , quantum network , bell's theorem , quantum mechanics , quantum , statistics , chemistry , mathematics
The design and implementation of a novel source of degenerate polarization entangled photon pairs in the telecom band, based on a cavity enhanced parametric downconversion process, is presented. Two of the four maximally entangled Bell states are produced; the remaining two are obtainable by the addition of a half wave plate into the setup. The coincident photon detection rate in the A/D basis between two detectors at the output of the device revealed the production of highly entangled states, resulting in quantum interference visibilities of 0.971 ± 0.041 (ϕ = 0 state) and 0.932 ± 0.036 (ϕ = π state) respectively. The entangled states were found to break the Clauser-Horne-Shimony-Holt (CHSH) Bell inequality by around 6 standard deviations. From the measured coincidence counting rates and the optical system losses, an entangled photon pair production rate of 8.9 × 10(4) s(-1) mW(-1) pump was estimated.