Optimized spectral purity of unfiltered photons via pump and nonlinearity shaping
Abstract
Photonic quantum technologies rely on the efficient generation and interference of indistinguishable photons. Exceptional achievements in this respect have been obtained by domain engineering of quasi-phase-matched parametric downconversion sources, demonstrating high two-photon interference visibility using only moderate bandpass spectral filtering. Here, we optimized the spectral purity and indistinguishability of photons from telecom-wavelength sources by combining Gaussian quasi-phase matching with Gaussian pump spectral shaping. Without spectral filtering, we used time-of-flight spectrometry to estimate an upper bound spectral purity of 99.9272(6)%, and achieved visibilities of up to 98.5(8)% in two-photon interference experiments with independent sources.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (9)
Tommaso Faleo
Institut für Experimentalphysik, Universität Innsbruck 1 , Technikerstr. 25, 6020 Innsbruck,
Christopher L. Morrison
Institute of Photonics and Quantum Sciences, School of Engineering and Physical Sciences, Heriot-Watt University 2 , Edinburgh EH14 4AS,
Roméo Beignon
Institut für Experimentalphysik, Universität Innsbruck 1 , Technikerstr. 25, 6020 Innsbruck,
Francesco Graffitti
Institute of Photonics and Quantum Sciences, School of Engineering and Physical Sciences, Heriot-Watt University 2 , Edinburgh EH14 4AS,
Vikas Remesh
Institut für Experimentalphysik, Universität Innsbruck 1 , Technikerstr. 25, 6020 Innsbruck,
Stefan Frick
Institut für Experimentalphysik, Universität Innsbruck 1 , Technikerstr. 25, 6020 Innsbruck,
Alessandro Fedrizzi
Gregor Weihs
Institut für Experimentalphysik, Universität Innsbruck 1 , Technikerstr. 25, 6020 Innsbruck,
Robert Keil
Institut für Experimentalphysik, Universität Innsbruck 1 , Technikerstr. 25, 6020 Innsbruck,