7 papers · 1 filter
Geometric obstructions to quadratic time scaling in multiparameter quantum estimation
Eoin O'Connor, Jiayu He, Matteo G. A. Paris +1
Unitary encoding of a single parameter provides quadratic enhancement in precision, with the quantum Fisher information scaling quadratically with the encoding time. However, when…
Bayesian stepwise estimation of qubit rotations
Mylenne Manrique, Marco Barbieri, Assunta Di Vizio +4
This work investigates Bayesian stepwise estimation (Se) for measuring the two parameters of a unitary qubit rotation. While asymptotic analysis predicts a precision advantage for…
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…
Enhanced quantum sensing of gravitational acceleration constant
Giorgio Stucchi, Matteo G. A. Paris
We investigate the use of quantum probes to accurately determine the strength of the local gravitational field on Earth. Our findings show that delocalized probes generally outperf…
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…
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…