Optimization of photon correlations by frequency filtering
Alejandro González-Tudela, Elena del Valle, Fabrice P. Laussy · Physical Review A · 2015
Photon correlations are a cornerstone of quantum optics. Recent works [E. del Valle, New J. Phys. 15, 025019 (2013); A. Gonzalez-Tudela et al., New J. Phys. 15, 033036 (2013); C. Sanchez Mu\~noz et al., Phys. Rev. A 90, 052111 (2014)] have shown that by keeping track of the frequency of the photons, rich landscapes of correlations are revealed. Stronger correlations are usually found where the system emission is weak. Here, we characterize both the strength and signal of such correlations, through the introduction of the ``frequency-resolved Mandel parameter.'' We study a plethora of nonlinear quantum systems, showing how one can substantially optimize correlations by combining parameters such as pumping, filtering windows and time delay.