One of the goals of quantum optics is to implement new sources of quantum light with tunable control of the
relevant photonic properties. Here, we add to the toolkit of available techniques in quantum optics for the full
control of the properties of quantum light, new strategies to manage the spectrum of photons, namely, type
of frequency correlations, bandwidth and waveform. As a source of quantum light, spontaneous parametric
downconversion (SPDC) is considered. Interestingly, the techniques presented might be used in any nonlinear
medium and frequency band of interest. One of the schemes to control the frequency correlations makes use of
light pulses with pulse-front tilt. The method is based on the proper tailoring of the group velocities of all the
waves that interact in the nonlinear process, through the use of beams with angular dispersion. Noncollinear
SPDC is the other strategy that is considered, since it allows mapping the spatial characteristics of the pump
beam into the frequency properties of the downconverted photons.
The bandwidth and the frequency correlations of quantum light can be considered as a resource for the implementation of new quantum information algorithms, and it should enable the applicability of quantum techniques not yet implemented. For that purpose, the control of the frequency correlations, and the bandwidth, of single and paired photons is an essential ingredient, since the optimum bandwidth, as well as the most appropriate type of frequency correlations for a specific quantum application, depend on the specific quantum information application under consideration. Here we elucidate and implement new strategies to tailor the frequency properties of quantum light. Such strategies, which are based on the use of non collinear spontaneous parametric down conversion (SPDC) configurations, include the generation of narrow and enhanced bandwidth quantum light, the control of the frequency correlations of paired photon, and the generation of heralded single photons with a high degree of purity from pairs of uncorrelated photons.
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