3 papers
quant-ph2025
Orders matter: tight bounds on the precision of sequential quantum estimation for multiparameter models
Gabriele Fazio, Jiayu He, Matteo G. A. Paris
In multiparameter quantum metrology, the ultimate precision of joint estimation is dictated by the Holevo Cramér-Rao bound. In this paper, we discuss and analyze in detail an alter…
quant-ph2025
Scrambling for precision: optimizing multiparameter qubit estimation in the face of sloppiness and incompatibility
Jiayu He, Matteo G. A. Paris
Multiparameter quantum estimation theory plays a crucial role in advancing quantum metrology. Recent studies focused on fundamental challenges such as enhancing precision in the pr…
quant-ph2025
Cartan Quantum Metrology
Gabriele Fazio, Jiayu He, Matteo G. A. Paris
We address the characterization of two-qubit gates, focusing on bounds to precision in the joint estimation of the three parameters that define their Cartan decomposition. We deriv…