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Updated: Jan 17, 2026
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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Compact and stable source of polarization-entangled photon-pairs based on a folded linear displacement interferometer
Optics Express
|September 23, 2025
Summary
We developed a compact, stable source for entangled photon pairs, crucial for building quantum networks. This system is designed for harsh environments, making it ideal for satellites and mobile quantum applications.
Area of Science:
- Quantum optics
- Quantum information science
- Photonics engineering
Background:
- Quantum networks require robust, low-size, weight, and power (SWaP) systems for remote and mobile applications like satellites.
- Entanglement-based quantum communication necessitates reliable sources of entangled photon pairs.
Purpose of the Study:
- To develop and characterize a compact, stable source of polarization-entangled photon-pairs suitable for deployment in quantum networks, particularly in challenging environments.
Main Methods:
- Utilized spontaneous parametric down-conversion (SPDC) in a Type-0 periodically poled potassium titanyl phosphate (PPKTP) crystal.
- Implemented a folded linear displacement interferometer with a compact, stable double-pass geometry employing a corner-cube retroreflector.
Main Results:
- Achieved a detected pair rate of 2.5 million pairs/second/milliwatt (M pairs/s/mW).
- Demonstrated a high Bell state fidelity of 94.1% ± 2.1%.
- The source exhibits compact dimensions and operational stability.
Conclusions:
- The developed entangled photon-pair source meets the stringent SWaP requirements for quantum network nodes.
- Its performance characteristics make it a strong candidate for practical implementation in entanglement-based quantum networks, including space-based systems.
