Multiparameter Quantum Metrology in Molecular Dimers
arXiv:2607.11831
The paper analyzes simultaneous quantum estimation of temperature and detuning in a molecular dimer of two interacting two‑level systems, showing that joint estimation can outperform separate measurements in near‑resonant, low‑temperature regimes.
Abstract
We investigate multiparameter quantum estimation in a molecular dimer composed of two dipole--dipole interacting two-level systems, focusing on the simultaneous estimation of temperature and detuning . By employing a vectorization approach to derive the quantum Fisher information matrix, we analyze the precision limits of both simultaneous and individual estimation strategies. We show that simultaneous estimation outperforms the individual one in the near-resonant and low-temperature regime, where quantum coherence is enhanced, while its advantage is progressively reduced under detuned conditions and increasing temperature. Our results demonstrate that temperature acts as a key control parameter governing both estimation precision providing a unified perspective on quantum metrology. These findings highlight the potential of molecular quantum systems as realistic platforms for multiparameter quantum sensing.
6 pages, 3 figures