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Frontiers in Optics

Flexible engineering of quantum state using multi-stage nonlinear interferometer

Jiamin Li, Jie Su, Liang Cui, Xiaoying Li, Z. Y. Ou

Published Jan 1, 2019• 0 citations
Publisher

Abstract

Using spontaneous four-wave mixing in a 3-stage nonlinear interferometer for temporal mode shaping, we efficiently generate heralded single photons in telecom band with near ideal modal purity and heralding efficiency.
DOI
10.1364/ls.2019.lm4d.3

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Single photon sources are a key building block for quantum information processing. A common approach uses spontaneous emitters based on parametric down conversion and four wave mixing. In 2005 experiments on the first spectrally engineered four wave mixing sources in fibre were published [1,2]. A primary obstacle for photonics to realize quantum-enhanced applications is loss. Designing single photon sources matched to single mode optical fibres greatly reduces coupling losses [3]. In addition, tailoring the phase matching properties of the sources to generate factorable photon pairs makes strong spectral filtering obsolete and thereby avoids the degradation of photon number correlations due to loss.