Microring resonators (MRR) are becoming a standard resource for highly efficient entangled photon pair generation. We examine the nonlinear processes in MRR using an input-output formalism that explicitly accounts for the contribution of the round trip circulation of the fields inside the MRR. This formalism reduces to the standard Langevin operator input-output formalism for cavities in the high cavity Q limit, near cavity resonances. Our approach is more general, applicable for arbitrary internal and bus-ring coupling losses, and away from resonances. We compare/contrast these two formalisms, and apply our approach to the output quantum state resulting from spontaneous parametric down conversion and spontaneous four wave mixing within the MRR. We compare our results to similar calculations employing the standard IO formalism, and note the role of the commutators of the noise operators on the undesired accidental singles rate.
P. M. Alsing and E. E. Hach, "Nonlinear processes in lossy microring resonators ," Proc. SPIE 10442, Quantum Information Science and Technology III, 104420M (Presented at SPIE Security + Defence: September 14, 2017; Published: 5 October 2017); https://doi.org/10.1117/12.2278576.
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