2025-09-10 米国国立標準技術研究所（NIST）
Credit: metamorworks/Shutterstock
＜関連情報＞
- https://www.nist.gov/news-events/news/2025/09/quantum-sensing-what-beats-beating-noise-meeting-noise-halfway
- https://journals.aps.org/prl/abstract/10.1103/dttc-ksdn
計量学的エンタングルメント優位性を有する共変量子誤り訂正符号 Covariant Quantum Error-Correcting Codes with Metrological Entanglement Advantage
Cheng-Ju Lin, Zi-Wen Liu, Victor V. Albert, and Alexey V. Gorshkov
Physical Review Letters Published 10 September, 2025
DOI:DOI: https://doi.org/10.1103/dttc-ksdn
Abstract
We show that a subset of the basis for the irreducible representations of a tensor-product SU(2) rotation forms a covariant approximate quantum error-correcting code with transversal U(1) logical gates. Generalizing previous work on “thermodynamic codes” to general local spin and different irreducible representations using only properties of the angular momentum algebra, we obtain bounds on the code inaccuracy under generic noise on any known sites, under independent and identically distributed noise, and under heralded -local erasures. We demonstrate that this family of codes protects a probe state with quantum Fisher information surpassing the standard quantum limit when the sensing parameter couples to the generator of the U(1) logical gate.
