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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Optimal design of error-tolerant reprogrammable multiport interferometers.

S A Fldzhyan, M Yu Saygin, S P Kulik

    Optics Letters
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    We introduce a new design for photonic information processing using static beam splitters and phase shifts. This approach offers greater resilience to errors and losses compared to traditional methods.

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    Area of Science:

    • Photonics
    • Quantum Information Science
    • Optical Engineering

    Background:

    • Programmable multiport interferometers are crucial for photonic information processing.
    • Existing designs often use error-sensitive Mach-Zehnder interferometers.
    • There is a need for robust and efficient interferometer designs.

    Purpose of the Study:

    • To propose a novel interferometer design for photonic information processing.
    • To demonstrate superior resilience to manufacturing errors and losses.
    • To analyze the implementability of arbitrary transfer matrices with the new design.

    Main Methods:

    • Utilizing a single static beam splitter (BS) and a variable phase shift as fundamental building blocks.
    • Investigating the impact of arbitrary power transmissivities (≈1/2 to ≈4/5) of static BSs.
    • Analyzing the fraction of non-implementable transfer matrices as a function of interferometer size.

    Main Results:

    • The proposed design exhibits enhanced resilience to manufacturing errors and losses.
    • The power transmissivities of static beam splitters can be varied within a specific range.
    • The proportion of non-implementable transfer matrices decreases rapidly with increasing interferometer size.

    Conclusions:

    • The novel interferometer design offers a promising alternative for photonic information processing.
    • The design's robustness makes it suitable for practical implementation.
    • Scalability of the design leads to improved matrix implementability.