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Multiphoton interference in a single-spatial-mode quantum walk
Optics Express
|August 13, 2025
Summary
Researchers demonstrate multiphoton interference using ultrafast time bins in a multiport interferometer. This advancement is key for developing quantum information processing and large-scale quantum technologies.
Area of Science:
- Quantum optics
- Photonic quantum technologies
- Quantum information science
Background:
- Multiphoton interference is fundamental to photonic quantum technologies.
- Interference enables optical quantum information processing and computational advantages.
- Studying interference in large interferometric networks is of significant interest.
Purpose of the Study:
- To implement and investigate multiphoton interference in a novel multiport interferometer.
- To explore the capabilities of ultrafast time bins for quantum walks.
- To measure multi-photon output states from various input light states.
Main Methods:
- Implementation of a stable, low-loss, multiport interferometer using birefringent crystals.
- Generation of ultrafast time bins with pulse separation of 4.3 ps.
- Utilizing ultrafast Kerr gating in optical fiber for time-demultiplexing quantum walk outputs.
- Measurement of one-, two-, and three-photon output states.
Main Results:
- Successful implementation of a quantum walk in a 12-ultrafast time-bin interferometer.
- Measurement of multi-photon interference from heralded single-photon, thermal, and attenuated coherent states.
- Demonstration of the capability to observe complex interference patterns.
Conclusions:
- Ultrafast time bins represent a promising platform for observing large-scale multiphoton interference.
- This technology is crucial for advancing photonic quantum technologies and quantum computation.
- The developed interferometer provides a robust system for studying quantum phenomena.
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