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Multiphoton interference in a single-spatial-mode quantum walk.

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    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.

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    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.