Decoherence-free subspaces in the noisy dynamics of discrete-step quantum walks in a photonic lattice
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arXiv
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| Format: | Preprint |
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2025
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| author | Asapanna, Rajesh Hainaut, Clément Amo, Alberto Gómez-León, Álvaro |
| author_facet | Asapanna, Rajesh Hainaut, Clément Amo, Alberto Gómez-León, Álvaro |
| contents | We study the noisy dynamics of periodically driven, discrete-step quantum walks in a one-dimensional photonic lattice. We find that in the bulk, temporal noise that is constant within a Floquet period leads to decoherence-free momentum subspaces, whereas fully random noise destroys coherence in a few time steps. When considering topological edge states, we observe decoherence no matter the type of temporal noise. To explain these results, we derive a non-perturbative master equation to describe the system's dynamics. We experimentally confirm our findings in a time multiplexed photonic lattice implemented in a double-fiber ring setup subject to laser pulse input states, in which we engineer different types of temporal noise. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_16204 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Decoherence-free subspaces in the noisy dynamics of discrete-step quantum walks in a photonic lattice Asapanna, Rajesh Hainaut, Clément Amo, Alberto Gómez-León, Álvaro Quantum Physics Disordered Systems and Neural Networks Optics We study the noisy dynamics of periodically driven, discrete-step quantum walks in a one-dimensional photonic lattice. We find that in the bulk, temporal noise that is constant within a Floquet period leads to decoherence-free momentum subspaces, whereas fully random noise destroys coherence in a few time steps. When considering topological edge states, we observe decoherence no matter the type of temporal noise. To explain these results, we derive a non-perturbative master equation to describe the system's dynamics. We experimentally confirm our findings in a time multiplexed photonic lattice implemented in a double-fiber ring setup subject to laser pulse input states, in which we engineer different types of temporal noise. |
| title | Decoherence-free subspaces in the noisy dynamics of discrete-step quantum walks in a photonic lattice |
| topic | Quantum Physics Disordered Systems and Neural Networks Optics |
| url | https://arxiv.org/abs/2510.16204 |