The Benchtop Polarization-Entangled Photon Sources (Ruby & Emerald) by OZ Optics are high-quality turn-key devices that provide polarization entanglement using crystal-based photon sources. These sources incorporate spontaneous parametric down-conversion in a self-balanced interferometer engine to generate wavelength/polarization entanglement.

The sources feature a wavelength-stabilized pump laser, variable optical attenuator, and temperature controller for fine-tuning phase matching parameters. Housed in a rugged aluminum casing, the sources have an on/off power switch and keyed laser control. They offer separate output ports for signal and idler photons with the pump wavelength removed.