2017/06/12 by Jacob G. Koefoed, Søren M. M. Friis, Jesper B. Christensen +1 · 20 citations
Computer Science · Engineering · Physics and Astronomy · #Amplified spontaneous emission #Dispersion (optics) #Four-wave mixing #Mixing (physics) #Phase (matter) #Phase matching #Photon #Photonic Crystal and Fiber Optics #Quantum Information and Cryptography #Quantum optics and atomic interactions #Raman scattering #Scattering #Spontaneous parametric down-conversion #quant-ph
paper · pdf · open access · doi:10.1364/oe.25.020835
published in Optics Express 25(17), 20835 (Optica Publishing Group)
arxiv created 2017/06/12 · openalex created_date 2017/06/23 · openalex publication_date 2017/08/17 · arxiv updated 2017/08/25 · openalex updated_date 2026/08/05
We model the spectral quantum-mechanical purity of heralded single photons from a photon-pair source based on nondegenerate spontaneous four-wave mixing taking the impact of distributed dispersion fluctuations into account. The considered photon-pair-generation scheme utilizes pump-pulse walk-off to produce pure heralded photons and phase matching is achieved through the dispersion properties of distinct spatial modes in a few-mode silica step-index fiber. We show that fiber-core-radius fluctuations in general severely impact the single-photon purity. Furthermore, by optimizing the fiber design we show that generation of single photons with very high spectral purity is feasible even in the presence of large core-radius fluctuations. At the same time, contamination from spontaneous Raman scattering is greatly mitigated by separating the single-photon frequency by more than 32 THz from the pump frequency.