Quantum

Noise-Induced Topology in Chiral Quantum Walks

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Briefings

Research published in 2026 demonstrates that dephasing noise, rather than destroying quantum coherence, can stabilize topological asymmetry in chiral quantum walks. The study reveals that noise-induced interactions create a band with a point gap, causing late-time relaxation modes to pile up at one edge of a finite chain. This phenomenon, termed 'noise-induced topology,' allows for a quantum ratchet effect driven solely by noise fluctuations, which is analytically tractable and experimentally feasible in platforms like superconducting qubits and optical lattices.

Key points

• Dephasing noise stabilizes topological asymmetry in chiral quantum walks by creating a band with a point gap.
• Noise-induced interactions cause late-time relaxation modes to pile up at one edge of a finite chain.

Context

Chiral quantum walks typically rely on interference between paths to spread asymmetrically, a process expected to be erased by noise. This study provides a counterintuitive finding where dephasing noise renders this asymmetry topologically robust, enabling a quantum ratchet effect without classical counterparts.

Limitations

The findings are based on a preprint (arXiv:2611.05471v1) and are subject to verification. The analysis assumes a finite chain and specific noise models; experimental validation and long-term stability under varying noise conditions remain to be confirmed.

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