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Updated: Aug 15, 2026
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Ultra-high-rate detection of entangled photon pairs
Optics Express
|August 14, 2026
Summary
Researchers achieved over 3 million counts per second of entangled photons using 16-pixel superconducting nanowire single-photon detectors (SNSPDs). This overcomes detector dead time limitations, enabling high-speed quantum information processing.
Area of Science:
- Quantum Information Science
- Photonics
- Quantum Optics
Background:
- High-rate detection of entangled photons is crucial for quantum information processing.
- Current limitations in coincidence rates stem from single-photon detector dead time.
- Existing experimental demonstrations have not met the demands of high-speed applications.
Purpose of the Study:
- To overcome the dead time limitations of single-photon detectors.
- To achieve multi-million counts per second (Mcps) coincidence rates for entangled photons.
- To enable high-speed photonic quantum information processing.
Main Methods:
- Utilized 16-pixel superconducting nanowire single-photon detectors (SNSPDs).
- Employed a 5-GHz clocked sequential time-bin entangled photon pair source.
- Conducted experiments on two-photon interference and CHSH inequality.
Main Results:
- Achieved coincidence rates exceeding 3 million counts per second (Mcps).
- Demonstrated multi-Mcps coincidence detection of entangled photons for the first time.
- Successfully mitigated the impact of detector dead time.
Conclusions:
- The developed method paves the way for high-speed entangled-photon-based quantum information processing.
- This breakthrough addresses a key bottleneck in current quantum technologies.
- Enables future advancements in quantum computing and communication.
