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Quantum photonic gates with two-dimensional random walkers.

S Ali Hassani Gangaraj, Dan T Nguyen

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    |August 13, 2025
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    Summary

    We developed novel quantum photonic gates using 2D random walking photons for quantum information processing. These gates show high fidelity, advancing linear optics quantum computation.

    Area of Science:

    • Quantum Information Science
    • Photonics
    • Quantum Computing

    Background:

    • Implementing quantum gates on photonic platforms is challenging due to photon propagation and interference.
    • Photonic quantum computation requires efficient and high-fidelity quantum gates.

    Purpose of the Study:

    • To propose and analyze novel quantum photonic gates using continuous time two-dimensional random walking photons.
    • To demonstrate the feasibility of implementing single-qubit (X-gate) and multi-qubit (C-NOT gate) gates.
    • To investigate the performance and spatial correlations of these random walking photon gates.

    Main Methods:

    • Utilizing inverse design for gate implementation in a silicon host medium with silicon dioxide scatterers.
    • Employing continuous time two-dimensional random walking photons.

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  • Analyzing gate fidelity and quantum correlations using the quantum correlation function.

    • Main Results:

    • Demonstrated high-fidelity probabilistic quantum gates, including C-NOT and X-gates.
    • Characterized non-trivial spatial correlations of random walking photons.
    • Validated the potential for photonic elements in quantum computation schemes.

    Conclusions:

    • The proposed quantum photonic gates offer a promising approach for linear optics quantum computation.
    • Further research is needed to address error correction for practical applications.
    • This work contributes to the advancement of practical photonic quantum computing elements.