Spectrally pure heralded single photons by spontaneous four-wave mixing in a fiber: reducing impact of dispersion fluctuations

Abstract

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.

References in corpus (7)

• Quantum Computing
• Heralded Generation of Ultrafast Single Photons in Pure Quantum States
• High quality asynchronous heralded single photon source at telecom wavelength
• Tailored photon-pair generation in optical fibers
• Nonclassical 2-photon interference with separate intrinsically narrowband fibre sources
• Characterisation of longitudinal variation in photonic crystal fibre
• The effect of self- and cross-phase modulation on photon-pairs generated by spontaneous four-wave mixing in integrated optical waveguides