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Updated: Aug 26, 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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Efficient quantum memory for photonic polarization qubits generated by cavity-enhanced spontaneous parametric
Optics Express
|October 12, 2022
Summary
Researchers achieved over 70% efficiency in storing heralded single photons using atomic quantum memories with electromagnetically induced transparency (EIT). This breakthrough enhances quantum memory capabilities for scalable quantum networks.
Area of Science:
- Quantum Information Science
- Atomic Physics
- Quantum Optics
Background:
- Quantum memories are essential for scalable quantum technologies, enabling on-demand storage and retrieval of photonic quantum states.
- Spontaneous parametric down-conversion (SPDC) is a common method for generating entangled photons and heralded single photons, but current quantum memories for these photons have efficiencies below 50%.
Purpose of the Study:
- To improve the efficiency of storing and retrieving heralded single photons generated via SPDC.
- To demonstrate high-fidelity storage of single-photon polarization qubits for quantum network applications.
Main Methods:
- Utilized cavity-enhanced SPDC to generate heralded single photons.
- Employed atomic quantum memories based on electromagnetically induced transparency (EIT) for photon storage.
- Measured storage and retrieval efficiency and quantum memory fidelity for polarization qubits.
Main Results:
- Achieved a storage and retrieval efficiency exceeding 70% for heralded single photons.
- Demonstrated a quantum memory fidelity of approximately 96% for single-photon polarization qubits.
Conclusions:
- The developed atomic quantum memory significantly surpasses the 50% efficiency threshold for practical applications.
- This high-efficiency, high-fidelity quantum memory is a critical step towards building large-scale quantum networks.
