Gershwin & Guaraldi EPG Polarization Entangled Photon Sources

Polarization Entangled Photon Source; Fiber-coupled or Free Space; Type-0, Type-1, Type-2 Phase Matching

Crystal-based, OZ Optics’ Gershwin & Guaraldi EPG polarization entangled photon source product line produces polarization entangled photon pairs through the process of spontaneous parametric down conversion (SPDC). These OEM sources are compact interferometers which can be configured for type-0, type-1, or type-2 phase matching.

Variants which support type-0/type-1 are called Guaraldi, while those supporting type-2 are called Gershwin. Both Guaraldi and Gershwin come optically coupled via fiber to free space focusers with pre-selected beam waists which can be customized upon request. Guaraldi and Gershwin are OEM-style devices designed to support the quantum optics R&D community.

Using a laser, a dichroic beam splitter, tomographic measurement equipment (half wave plate (HWP), quarter wave plate (QWP), polarizing beam splitter (PBS)), and single photon detectors (e.g. IDQube), it takes seconds to measure photon pairs, and only a few trial settings of the HWP to generate and confirm very high quality (>95% fidelity) polarization entanglement.

Guaraldi and Gershwin can be operated in two modes:

• Pair production mode: To create pairs, the HWP is set to 0 or 45 degrees. The generator is pumped with a suitable (correct wavelength) laser and the output can be split with either a 50:50 beam splitter or a dichroic.
• Polarization entanglement mode: Here, the operation is identical to pair production mode except that the HWP is set to 22.5 degrees. Further optimization of the entanglement quality can be achieved by small adjustments to the HWP setting if desired.

Key Features:

• Customizable: Supports Type-0, Type-1, and Type-2 Phase Matching, Custom Beam Waist Selection, and Coupling Optics
• Tunable Entanglement (Fidelity Range 0 - 95%)
• Pre-aligned and Stable
• Pump Blocking for Basis Alignment
• Fiber-coupled or Free Space Options
• Count Rates: Kcps to Mcps
• Heralding Efficiencies: >0.1 to 0.5
• Max. TEC Voltage: 5.6 V, 5.8 V
• Max. TEC Current: 6 A
• Max. Operating Temperature: +80°C
• Dimensions: 192 x 130 x 76 mm (Gershwin), 204 x 66 x 76 mm (Guaraldi)

Applications: Fundamental Quantum Information Science; Quantum Key Distribution; Quantum Computing; Quantum Metrology