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Peer-reviewedCC BY 4.0Physical Review A

Decoherence-free subspaces in the noisy dynamics of discrete-step quantum walks in a photonic lattice

  • Rajesh Asapanna
  • Clément Hainaut
  • Alberto Amo
  • Álvaro Gómez-León
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Abstract

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 nonperturbative 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.

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Cite

BibTeXRIS
BibTeX
@article{asapanna2026decoherencefree,
  title = {{Decoherence-free subspaces in the noisy dynamics of discrete-step quantum walks in a photonic lattice}},
  author = {Rajesh Asapanna and Clément Hainaut and Alberto Amo and Álvaro Gómez-León},
  journal = {Physical Review A},
  year = {2026},
  month = sep,
  doi = {10.1103/dxjw-bmng},
  eprint = {2510.16204},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05761659v1},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Decoherence-free subspaces in the noisy dynamics of discrete-step quantum walks in a photonic lattice
AU  - Rajesh Asapanna
AU  - Clément Hainaut
AU  - Alberto Amo
AU  - Álvaro Gómez-León
PY  - 2026
DA  - 2026/09/23
JO  - Physical Review A
DO  - 10.1103/dxjw-bmng
UR  - https://hal.science/hal-05761659v1
AB  - 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 nonperturbative 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.
SN  - 2469-9926
SN  - 2469-9934
ER  -