Pure dephasing increases partition noise in the quantum Hall effect
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arXiv
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866914320047144960 |
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| author | Beenakker, C. W. J. |
| author_facet | Beenakker, C. W. J. |
| contents | Quantum Hall edge channels partition electric charge over N chiral (uni-directional) modes. Intermode scattering leads to partition noise, observed in graphene p-n junctions. While inelastic scattering suppresses this noise by averaging out fluctuations, we show that pure (quasi-elastic) dephasing may enhance the partition noise. The noise power increases by up to 50% for two modes, with a general enhancement factor of 1+1/N in the strong-dephasing limit. This counterintuitive effect is explained in the framework of monitored quantum transport, arising from the self-averaging of quantum trajectories. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_10242 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Pure dephasing increases partition noise in the quantum Hall effect Beenakker, C. W. J. Mesoscale and Nanoscale Physics Quantum Hall edge channels partition electric charge over N chiral (uni-directional) modes. Intermode scattering leads to partition noise, observed in graphene p-n junctions. While inelastic scattering suppresses this noise by averaging out fluctuations, we show that pure (quasi-elastic) dephasing may enhance the partition noise. The noise power increases by up to 50% for two modes, with a general enhancement factor of 1+1/N in the strong-dephasing limit. This counterintuitive effect is explained in the framework of monitored quantum transport, arising from the self-averaging of quantum trajectories. |
| title | Pure dephasing increases partition noise in the quantum Hall effect |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2509.10242 |