Spin squeezing and decoherence limit in Ramsey spectroscopy
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It is known that a partially entangled state gives improved sensitivity in generalized Ramsey spectroscopy in the presence of decoherence, whereas a maximally entangled state does not. However, it has been an open question whether the known decoherence limit in the improvement is achievable. We show that every spin-squeezed state possesses pairwise entanglement, thereby improving the spectroscopic sensitivity, and that even suboptimal entanglement in its easiest implementation suffices to asymptotically reach the decoherence limit without any measurement optimization.
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With eq. (8) and the fact that the Fisher information obeys F ≤ N^2, the limit on the speed of evolution imposes the persistence of the standard scaling Δφ ∼ 1/√N no matter how weak the dephasing rate.
“Then with eq. (8) and the fact that the Fisher information obeys F ≤ N 2 [34, 35], the limit on the speed of evolution imposes the persistence of the standard scaling D f ∼ 1 / √ N no matter how weak the dephasing rate.”
From Quantum Speed Limits in Open System Dynamics (2013) · cites this paper as [34]
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- Authors
- Ulam-Orgikh, D., & Kitagawa, M.
- Affiliations
- The University of Osaka (JP)
- Japan Science and Technology Agency (JP)
- ORCID
- Kitagawa, Masahiro
- Venue
- Physical Review A
- Publisher
- American Physical Society (APS)
- Published
- 2001-10-08
- Volume
- 64
- Issue
- 5
- Pages
- 052106
- ISSN
- 0556-2791 (ISSN-L)
- 1050-2947
- 1094-1622
- OpenAlex
- W1977274416
- Cited by
- 130
- References
- 29
- Citations by year
- 2026: 1 · 2025: 5 · 2024: 5 · 2023: 4 · 2022: 4 · 2021: 3 · 2020: 9 · 2019: 3 · 2018: 6 · 2017: 11 · 2016: 9 · 2015: 9 · 2014: 5 · 2013: 9 · 2012: 6
- FWCI
- 5.19
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Physical Review A (publishedVersion)
- OUKA (Osaka University Knowledge Archive) (Osaka University) (submittedVersion)
- Institutional Repositories DataBase (IRDB) (submittedVersion)
- Funders
- Ministry of Education, Culture, Sports, Science and Technology (CREST)
- Core Research for Evolutional Science and Technology
- Topics
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum optics and atomic interactions
- Keywords
- spin squeezing, decoherence, Ramsey spectroscopy, pairwise entanglement, partially entangled states, maximally entangled states, quantum metrology, sensitivity limits, measurement optimization
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