Observation of Criticality-Enhanced Quantum Sensing in Nonunitary Quantum Walks
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866910015910051840 |
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| author | Xiao, Lei Sarkar, Saubhik Wang, Kunkun Bayat, Abolfazl Xue, Peng |
| author_facet | Xiao, Lei Sarkar, Saubhik Wang, Kunkun Bayat, Abolfazl Xue, Peng |
| contents | Quantum physics enables parameter estimation with precisions beyond the capability of classical sensors. Quantum criticality is a key resource for this quantum-enhanced sensing, but experimental realization has been challenging due to the complexity of ground-state preparation and the long time required to reach the steady state near criticality. Here, we experimentally demonstrate critical enhancement in a non-Hermitian topological system using a photonic quantum walk setup. Our system supports two distinct phase transitions at which enhanced sensitivity is observed even at transient times for which the Bayesian inference shows excellent estimation and precision. It is a direct demonstration of criticality-enhanced scaling laws with non-unitary dynamics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_16133 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observation of Criticality-Enhanced Quantum Sensing in Nonunitary Quantum Walks Xiao, Lei Sarkar, Saubhik Wang, Kunkun Bayat, Abolfazl Xue, Peng Quantum Physics Quantum physics enables parameter estimation with precisions beyond the capability of classical sensors. Quantum criticality is a key resource for this quantum-enhanced sensing, but experimental realization has been challenging due to the complexity of ground-state preparation and the long time required to reach the steady state near criticality. Here, we experimentally demonstrate critical enhancement in a non-Hermitian topological system using a photonic quantum walk setup. Our system supports two distinct phase transitions at which enhanced sensitivity is observed even at transient times for which the Bayesian inference shows excellent estimation and precision. It is a direct demonstration of criticality-enhanced scaling laws with non-unitary dynamics. |
| title | Observation of Criticality-Enhanced Quantum Sensing in Nonunitary Quantum Walks |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2506.16133 |