Quantum metrology enhanced by effective time reversal
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866912912625369088 |
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| author | Wang, Yu-Xin Salvati, Flavio Arvidsson-Shukur, David R. M. Braasch Jr., William F. Murch, Kater Halpern, Nicole Yunger |
| author_facet | Wang, Yu-Xin Salvati, Flavio Arvidsson-Shukur, David R. M. Braasch Jr., William F. Murch, Kater Halpern, Nicole Yunger |
| contents | Quantum metrology involves the application of quantum resources to enhance measurements. Several communities have developed quantum-metrology strategies that leverage effective time reversals. These strategies, we posit, form four classes. First, echo metrology begins with a preparatory unitary and ends with that unitary's time-reverse. The protocol amplifies the visibility of a small parameter to be sensed. Similarly, weak-value amplification enhances a weak coupling's detectability. The technique exhibits counterintuitive properties captured by a retrocausal model. Using the third strategy, one simulates closed timelike curves, worldlines that loop back on themselves in time. The fourth strategy involves indefinite causal order, which characterises channels applied in a superposition of orderings. We review these four strategies, which we unify under the heading of time-reverse metrology. We also outline opportunities for this toolkit in quantum metrology; quantum information science; quantum foundations; atomic, molecular, and optical physics; and solid-state physics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_20952 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Quantum metrology enhanced by effective time reversal Wang, Yu-Xin Salvati, Flavio Arvidsson-Shukur, David R. M. Braasch Jr., William F. Murch, Kater Halpern, Nicole Yunger Quantum Physics Quantum metrology involves the application of quantum resources to enhance measurements. Several communities have developed quantum-metrology strategies that leverage effective time reversals. These strategies, we posit, form four classes. First, echo metrology begins with a preparatory unitary and ends with that unitary's time-reverse. The protocol amplifies the visibility of a small parameter to be sensed. Similarly, weak-value amplification enhances a weak coupling's detectability. The technique exhibits counterintuitive properties captured by a retrocausal model. Using the third strategy, one simulates closed timelike curves, worldlines that loop back on themselves in time. The fourth strategy involves indefinite causal order, which characterises channels applied in a superposition of orderings. We review these four strategies, which we unify under the heading of time-reverse metrology. We also outline opportunities for this toolkit in quantum metrology; quantum information science; quantum foundations; atomic, molecular, and optical physics; and solid-state physics. |
| title | Quantum metrology enhanced by effective time reversal |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2601.20952 |