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Compressive Imaging of Broadband Single-Photon Sources With Superconducting Detectors

J. Schaake, Philip G. Evans, Raphael C. Pooser

Published Jan 1, 2015• 0 citations
Publisher

Abstract

We experimentally characterize the spatio-spectral properties of photon pairs generated by spontaneous parametric down-conversion in a Type-0 PPKTP waveguide using compressive imaging techniques combined superconducting single photon detectors.
DOI
10.1364/cleo_at.2015.jw2a.18

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The first experimental preparation is reported of an ultra-broadband continuously-tunable highly polarization-entangled photon-pair source via spontaneous parametric down-conversion in a single type-II phase-matched bulk periodically-poled KTiOPO4 (PPKTP) crystal. A tuning band of more than 60 nm for the down-converted photons is achieved experimentally, which covers the C+L telecom bands. The photon pair generation rate is about 1.63 × 104 (s mW nm)−1. The calculated S parameter values of CHSH inequality between 2.60 ± 0.04 (minimum) and 2.72 ± 0.07 (maximum) over the whole tunable range clearly demonstrate high entanglement of the source. In combination with the dense wavelength-division multiplexing (DWDM) technique, our source could be used to enhance the transmission capacity of a communication channel in the field of quantum communication.