Abstract
Optical fibers have been considered an optimal platform for third-order parametric down-conversion since they can potentially overcome the weak third-order nonlinearity by their long interaction length. Here we present, in the first part, a theoretical derivation for the conversion rate both in the case of spontaneous generation and in the presence of a seed beam. Then we review three types of optical fibers and we examine their properties in terms of conversion efficiency and practical feasibility.
Highlights
Optical fibers have proved to be extremely efficient platforms for generating nonclassical states [1,2,3,4]
It is worth noting that dN (ω1, ω2) and dR(ω1, ω2, ω3) have different dimensionality, the former being the number of pairs emitted per pulse and the latter being a rate of triplet emission (Hz) in the cw regime
We consider a tapered fiber, which has a high overlap between the two phase matching modes due to their high confinement and whose dispersion can be tuned by changing the gas pressure of the environment [23]
Summary
Optical fibers have proved to be extremely efficient platforms for generating nonclassical states [1,2,3,4]. Direct generation of photon triplet states via the cubic interaction has been a long-standing goal in the field of quantum optics dating as far back as the 1980s [5,6,7,8,9,10,11,12,13,14,15] The interest for this process, known as third-order parametric down-conversion (TOPDC), is driven by the fact that such an interaction leads to the direct generation of a non-Gaussian state [5]. The output state of these modes in this case is expected to be the same as for the usual two-photon spontaneous parametric down-conversion (SPDC) [19], seeding can be used to study the TOPDC spectral features, similar to the way stimulated emission tomography (SET) [20] is used to characterize SPDC
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