Abstract
Advanced photonic quantum technology relies on multiphoton interference, which requires bright sources of high-purity photons. Single-photon sources based on nonlinear parametric processes typically require lossy spectral filtering for enhancing the spectral purity of the heralded photons. Here, we implement a novel domain-engineering technique for tailoring the nonlinearity of a parametric down-conversion crystal in order to generate indistinguishable and spectrally pure photons without filtering. We create pairs of independently heralded telecom-wavelength photons with high heralding efficiency (up to 65%) and brightness (4 kHz/mW), and we demonstrate a high lower bound for the indistinguishability 98.7 0.2% and spectral purity 90.7 0.3% via two-photon interference experiments.
Original language | English |
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Pages (from-to) | 514-517 |
Number of pages | 4 |
Journal | Optica |
Volume | 5 |
Issue number | 5 |
Early online date | 30 Apr 2018 |
DOIs | |
Publication status | Published - 20 May 2018 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
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Alessandro Fedrizzi
- School of Engineering & Physical Sciences - Professor
- School of Engineering & Physical Sciences, Institute of Photonics and Quantum Sciences - Professor
Person: Academic (Research & Teaching)