Work

Optimal phase estimation in the presence of correlated dephasing

Year: 2026

Type: article

Abstract: We investigate optimal metrological protocols for phase estimation in the presence of correlated dephasing noise, including spin-squeezed state sensing strategies as well as parallel and adaptive protocols optimized using tensor-network-based numerical methods. The results are benchmarked against fundamental bounds obtained either via the latest quantum comb extension method or an optimized classical simulation method. We find that the spin-squeezed states offer practically optimal performance in the regime where phase fluctuations are positively correlated but can be outperformed by tensor-network-optimized strategies for negatively correlated fluctuations.

Source: Quantum

DOI: 10.22331/q-2026-10-28-2251

Authors: Srijon Ghosh, Arkadiusz Kobus, Stanisław Kurdziałek, Rafał Demkowicz-Dobrzański

Institutions: University of Electronic Science and Technology of China, University of Warsaw, University of Palermo, Institute of Physics

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $215

Funder: Fundacja na rzecz Nauki Polskiej