The DOI matches its Crossref record; 43 of the 43 references it cites were found in a registry or an index.
Fundamental limits and non-reciprocal approaches in non-Hermitian quantum sensing
Open accessAbstract
Unconventional properties of non-Hermitian systems, such as the existence of exceptional points, have recently been suggested as a resource for sensing. The impact of noise and utility in quantum regimes however remains unclear. In this work, we analyze the parametric-sensing properties of linear coupled-mode systems that are described by effective non-Hermitian Hamiltonians. Our analysis fully accounts for noise effects in both classical and quantum regimes, and also fully treats a realistic and optimal measurement protocol based on coherent driving and homodyne detection. Focusing on two-mode devices, we derive fundamental bounds on the signal power and signal-to-noise ratio for any such sensor. We use these to demonstrate that enhanced signal power requires gain, but not necessarily any proximity to an exceptional point. Further, when noise is included, we show that nonreciprocity is a powerful resource for sensing: it allows one to exceed the fundamental bounds constraining any conventional, reciprocal sensor.
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Non-Hermitian physics and PT symmetry
El-Ganainy, R., Makris, K. G., Khajavikhan, M., Musslimani, Z. H., Rotter, S., & Christodoulides, D. N. (2018) · Nature Physics · doi:10.1038/nphys4323 · Cited by 2,721
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Exceptional points enhance sensing in an optical microcavity
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Self-citationEnhanced sensitivity at higher-order exceptional points
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Observation of parity-time symmetry breaking in a single-spin system
Wu, Y., Liu, W., Geng, J., Song, X., Ye, X., Duan, C.-K., Rong, X., & Du, J. (2019) · Science · doi:10.1126/science.aaw8205 · Cited by 426
Classification of Exceptional Points and Non-Hermitian Topological Semimetals
Kawabata, K., Bessho, T., & Sato, M. (2019) · Physical Review Letters · doi:10.1103/physrevlett.123.066405 · Cited by 404
Non-Hermitian interacting quantum walks of correlated photons
Wan, T., & Yang, Z. (2025) · Communications Physics · doi:10.1038/s42005-025-02038-9 · Cited by 3
Metadata
- Authors
- Lau, H.-K., & Clerk, A. A.
- Venue
- Nature Communications
- Published
- 2018-10-17
- Volume
- 9
- Issue
- 1
- Pages
- 4320-4320
- ISSN
- 2041-1723 (ISSN-L)
- OpenAlex
- W3104133164
- Cited by
- 380
- References
- 43
- FWCI
- 12.62
- Type
- journal article
- Language
- en
- Open access
- gold
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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