Abstract

High-purity, non-classical light, such as two-mode entanglement, is essential for quantum sensing, quantum communications and networking, and quantum computing. Two-mode entanglement is typically generated via spontaneous parametric down-conversion (SPDC) processes in nonlinear, periodically poled electro-refractive crystals, producing bi-photon pairs entangled in polarization, frequency, time-bin, or optical quadrature. Although these practical sources of two-mode entanglement aim to achieve high photon pair rates and optical wavelength flexibility, they often face quantum state loss due to sub-unit efficiencies in waveguides, fiber coupling, wavelength conversion, non-ideal phase matching in the crystal and residual noise from pump light. To address this, we derive a complete parametric quantum mechanical description of these processes using density matrices to model the mixed quantum states …

Date

2025

Authors

Alireza Alipour, Jonathan Habif

Conference

SMT 2025