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Updated: Sep 25, 2025
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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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Mitigating indistinguishability issues in photon pair sources by delayed-pump intermodal four wave mixing.
Optics Express
|April 27, 2022
Summary
Researchers improved heralded single photon sources for quantum computing by using waveguide tapering and controlled pump delays. This technique enhances spectral indistinguishability, crucial for building large-scale quantum systems.
Area of Science:
- Quantum optics
- Quantum computing
- Photonics
Background:
- Heralded single photon sources are vital for quantum computing.
- Intermodal four-wave mixing (IFWM) in waveguides is a promising source technology.
- Fabrication imperfections limit spectral indistinguishability between sources.
Purpose of the Study:
- To enhance spectral indistinguishability of heralded single photon sources.
- To overcome fabrication imperfections in quantum computing resources.
- To improve the performance of independent photon sources.
Main Methods:
- Utilizing delayed-pump intermodal four-wave mixing (IFWM).
- Implementing waveguide width tapering.
- Controlling pump pulse delays for spectral tunability.
Main Results:
- Achieved >99.5% spectral indistinguishability for independent sources on-chip.
- Predicted maximum degradation of Hong-Ou-Mandel visibility <0.35%.
- Demonstrated additional spectral tunability via waveguide tapering and pump delay control.
Conclusions:
- Waveguide tapering and controlled pump delay effectively recover spectral indistinguishability.
- This method significantly improves the reliability of photon sources for quantum computing.
- The approach offers a pathway to scalable quantum computing with improved photon source quality.
