Optimization of a Lossy Microring Resonator System for the Generation of Quadrature-Squeezed States

TL;DR

This paper models and optimizes a lossy microring resonator system to maximize quadrature squeezing of light generated via SPDC, providing design guidelines for enhanced quantum state production.

Contribution

It introduces an analytical framework for optimizing pump pulse duration and coupling in lossy microring resonators to generate quadrature-squeezed states.

Findings

Derived approximate formulas for optimal coupling and pulse duration based on loss

Identified conditions for maximum squeezing in lossy resonators

Provided practical design guidelines for quantum light sources

Abstract

The intensity buildup of light inside a lossy microring resonator can be used to enhance the generation of squeezed states via spontaneous parametric downconversion (SPDC). In this work, we model the generation of squeezed light in a microring resonator that is pumped with a Gaussian pulse via a side-coupled channel waveguide. We theoretically determine the optimum pump pulse duration and ring-to-channel coupling constant to minimize the quadrature noise (maximize the squeezing) in the ring for a fixed input pump energy. We derive approximate analytic expressions for the optimal coupling and pump pulse duration as a function of scattering loss in the ring. These results will enable researchers to easily determine the optimal design of microring resonator systems for the generation of quadrature-squeezed states.