Mode expansion and Bragg filtering enable a high-fidelity fiber-based photon-pair source

Abstract

We report the development of a fiber-based single spatial mode source of photon-pairs where the efficiency of extracting photon-pairs is improved over a previous source [18] through the use of fiber-end expansion and Bragg filters. This improvement in efficiency enabled a spectrally bright and pure photon-pair source having a small second-order correlation function (0.03) and a raw spectral brightness of 44,700 pairs/(s nm mW). The source can be configured to generate entangled photon-pairs,characterized via optimal and minimal quantum state tomography, to have a fidelity of 97% and tangle of 92%, without subtracting any background.

Manuscript was edited to provide additional information on the end-tapered photonic crystal fibers and high efficiency volume Bragg gratings. The analysis of the extraction efficiency was also expanded, and experimental uncertainties included where relevant. This paper has been accepted for publication in Optics Express

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• Quantum Non-Objectivity from Performativity of Quantum Phenomena
• Photon-pair generation in photonic crystal fibrebre with a 1.5GHz modelocked VECSEL
• Simple performance evaluation of pulsed spontaneous parametric down-conversion sources for quantum communications