Fig. 3: Effect of modulation on spontaneous four-wave mixing spectra.
From: Programmable frequency-bin quantum states in a nano-engineered silicon device
Normalized spontaneous four-wave mixing spectra for the a idler and b signal channels after demultiplexing both in the absence (upper panels) and presence (lower panels) of modulation. The bin pair order m with respect to the pump resonances is marked, while spontaneous four-wave mixing generated in the add-drop filter rings is marked as F. Note that, despite the different out-coupling efficiency for each resonance and the limited resolution of the spectrometer, it is still possible to observe the expected symmetry in the intensity of the generated bins, and how the bin spacing increases with the azimuthal order m. Lower panels show the effect of the double-sideband suppressed-carrier modulation on the signal and idler spectra, where only the first-order sidebands are preserved. The spectra shown here are associated with generation of the state described by Eq. (1), where we chose θ = π (Bell state \(\left|{\Phi }^{-}\right\rangle\)). Analogous spectra are attainable for any of the device configurations discussed in this work.
