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Updated: May 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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A tunable entangled photon-pair source based on a Van der Waals insulator.
Xiaodan Lyu1, Leevi Kallioniemi1, Hao Hong2
1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore.
Nature Communications
|February 23, 2025
Summary
Rhombohedral boron nitride (r-BN) enables efficient generation of entangled photons for quantum technologies. This scalable material offers high generation rates and tunable Bell states for compact quantum devices.
Area of Science:
- Quantum optics
- Materials science
- Solid-state physics
Background:
- Scalable quantum photonic devices are crucial for quantum communication, computing, and cryptography.
- Compact sources of entangled photons are essential for advancing these quantum technologies.
- Conventional hexagonal boron nitride has limitations in nonlinear response due to its centrosymmetric structure.
Purpose of the Study:
- To demonstrate entangled photon pair generation in rhombohedral boron nitride (r-BN).
- To leverage the unique optical and structural properties of r-BN for efficient quantum light sources.
- To establish r-BN as a viable material for on-chip integrated quantum optical applications.
Main Methods:
- Utilizing the specific interlayer ABC stacking and in-plane inversion symmetry of r-BN.
- Investigating the nonlinear optical properties of r-BN for photon pair generation.
- Characterizing the generation rate, entanglement quality, and fidelity of the generated entangled photons.
Main Results:
- Achieved an entangled photon pair generation rate of up to 8667 Hz/(mW·mm).
- Demonstrated a tunable platform for Bell state generation by adjusting pump polarization.
- Measured polarization entangled states with a fidelity of up to 94% without compromising efficiency.
Conclusions:
- r-BN exhibits highly efficient entangled photon generation due to its unique structural and optical properties.
- The developed system represents a significant step towards ultrathin, scalable quantum devices.
- r-BN is a promising material for developing on-chip integrated quantum optical applications.
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