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On-Chip Quantum Interference between Independent Lithium Niobate-on-Insulator Photon-Pair Sources
Robert J Chapman1, Tristan Kuttner1, Jost Kellner1
1ETH Zurich, Optical Nanomaterial Group, Institute for Quantum Electronics, Department of Physics, CH-8093 Zurich, Switzerland.
Physical Review Letters
|June 23, 2025
Summary
This study demonstrates a lithium niobate-on-insulator (LNOI) chip for generating entangled photon pairs and performing quantum interference. The integrated photonic circuit achieves high brightness and visibility, advancing quantum information science.
Area of Science:
- Quantum Information Science
- Integrated Photonics
- Quantum Optics
Background:
- Scalable quantum information processing relies on integrated photonic circuits.
- Efficient generation of indistinguishable photon-pairs and high-visibility quantum interference are critical requirements.
Purpose of the Study:
- To demonstrate a lithium niobate-on-insulator (LNOI) integrated photonic circuit for generating entangled photons and performing quantum interference.
- To achieve high brightness and visibility for on-chip quantum photonic applications.
Main Methods:
- Fabrication of an LNOI integrated photonic circuit.
- Generation of two-photon path-entangled states.
- Implementation of a programmable interferometer for quantum interference experiments.
Main Results:
- Achieved entangled photon generation brightness of ~2.3x10^8 pairs/s/mW.
- Demonstrated quantum interference visibility of 96.8±3.6% on-chip.
- Utilized LNOI technology for efficient nonlinear processes.
Conclusions:
- The developed LNOI circuit enables efficient photon-pair generation and high-visibility quantum interference.
- This work paves the way for large-scale integrated quantum photonics.
- Potential applications include boson sampling and quantum communications.
