We present a scalable chiral waveguide architecture for the on-demand nonlinear conversion of a single pump photon into a Stokes and anti-Stokes pair. Our model is implemented using a four-level atom coupled to three waveguide modes and controlled by an external light beam in the double-$\mathrm{\Lambda }$ configuration. With a suitable choice of atom-level symmetry, pump-photon coherence time, and control-beam intensity, this model allows to achieve near perfect or slightly discounted conversion efficiencies, when external decay channels are neglected or included, as well as ideal pair-state purities and strong cross-correlations. This suggests a promising route toward quasi-deterministic biphoton generation, while other approaches struggle to simultaneously optimize these figures of merit.

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• Frequency conversion
• Hybrid quantum systems
• Photon pairs & parametric down-conversion
• Quantum description of light-matter interaction
• Single photon sources
• Optical fibers
• Trapped atoms
• Waveguides
• Electric moment
• Dipole approximation
• Four-wave mixing
• Nonperturbative methods
• Rotating wave approximation
• Schroedinger equation