Idealphotonics' correlated photon pair sources are physical devices that generate photon pairs with quantum correlations (such as energy, momentum, polarization, or time entanglement) through nonlinear optical processes (e.g., spontaneous parametric down-conversion, SPDC) or quantum dot mechanisms. Their core feature is that the photon pairs exhibit nonlocal correlations governed by quantum mechanics, violating classical Bell inequalities and providing essential resources for quantum information processing.By generating photon pairs with non-classical correlations via quantum entanglement (such as polarization, time, or energy entanglement), these sources offer high coincidence count rates, low noise, and compatibility with communication bands, providing indispensable quantum resources for quantum communication, computing, and precision measurement.