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Updated: Jun 26, 2025

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Photonic random walks with traps.

Stefano Longhi

    Optics Letters
    |May 15, 2024
    PubMed
    Summary
    This summary is machine-generated.

    Quantum walks of photons in lattices with traps behave distinctively from classical random walks. Photons in quantum walks can survive indefinitely, unlike classical particles which are always destroyed by traps.

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    Area of Science:

    • Quantum physics
    • Condensed matter physics
    • Photonics

    Background:

    • Classical and quantum random walks exhibit fundamentally different behaviors.
    • Traps in a lattice can terminate random walks by destroying the particle.
    • Understanding particle behavior in lattices is crucial for quantum technologies.

    Purpose of the Study:

    • To investigate the distinct behaviors of classical and quantum random walks (RWs) of photons in a 1D lattice with traps.
    • To demonstrate how quantum walks can avoid termination by traps, unlike classical walks.
    • To explore the transition between quantum and classical random walks using controllable decoherence.

    Main Methods:

    • Simulating classical and quantum random walks of photons in a 1D lattice.

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  • Introducing a finite number of traps to observe walk termination.
  • Utilizing synthetic mesh lattices with controllable decoherence to switch between quantum and classical regimes.

    • Main Results:

    • Classical random walks of photons are inevitably terminated by traps.
    • Quantum walks of photons can persist indefinitely, avoiding trap destruction.
    • Controllable decoherence allows for a tunable transition from quantum to classical random walk behavior.

    Conclusions:

    • Quantum walks offer a pathway for particles to evade destruction in trapping potentials, a stark contrast to classical walks.
    • The ability to control decoherence provides a method to study the quantum-to-classical transition in random walks.
    • This research highlights unique quantum phenomena in photon transport within lattice structures.