2017/04/20 by Francesco Graffitti, Dmytro Kundys, Derryck T. Reid +4 · 1 citation
Engineering · Physics and Astronomy · #Advanced Fiber Laser Technologies #Ideal (ethics) #Nonlinear Optical Materials Studies #Nonlinear optics #Nonlinear system #Parametric statistics #Photon #Photonic crystal #Photorefractive and Nonlinear Optics #Quantum #Quantum optics #quant-ph
paper · pdf · doi:10.1088/2058-9565/aa78d4
published as Quantum Sci. Technol. 2, 035001 (2017) · 12 pages, 4 figures. Minor update to Fig. 3
arxiv created 2017/04/20 · openalex created_date 2017/04/28 · openalex publication_date 2017/07/12 · arxiv updated 2017/12/20 · openalex updated_date 2026/08/06
Photonic quantum technology relies on efficient sources of coherent single photons, the ideal carriers of quantum information. Heralded single photons from parametric down-conversion can approximate on-demand single photons to a desired degree, with high spectral purities achieved through group-velocity matching and tailored crystal nonlinearities. Here we propose crystal-nonlinearity-engineering techniques with sub-coherence-length domains. We first introduce a combination of two existing methods: a deterministic approach with coherence-length domains and probabilistic domain-width annealing. We then show how the same deterministic domain-flip approach can be implemented with sub-coherence-length domains. Both of these complementary techniques create highly pure photons, outperforming previous methods, in particular for short nonlinear crystals matched to femtosecond lasers.