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We study photon pair generation through scalar spontaneous four-wave mixingin single-mode fibre and for frequency-degenerate pumps; we concentrate onsource geometries which fulfil full group velocity matching (GVM), i.e. wherethe pump, signal and idler propagate at identical group velocities. We discusstwo experimental techniques which permit the attainment of full GVM, anddiscuss the resulting two-photon state properties. In particular, we show thatfull GVM can lead to sources which approach phasematching unconstrained bydispersion and therefore with a remarkably large bandwidth. We also discuss thegeneration of nearly-factorablestates as an application of full GVM.

Tailored photon pair preparation relying on full group velocity matching in fibre-based spontaneous four wave mixing