Characterizing and Overcoming Quantum Metrology Singularities

Speaker's Name: Abolfazl Bayat
Speaker's Affiliation: University of Electronic Science and Technology of China
Speaker's Research Theme(s): Mathematical Physics, Quantum information and metrology
Abstract:
The simultaneous estimation of multiple unknown parameters is the most general scenario in quantum sensing. Quantum multi-parameter estimation theory provides fundamental bounds on the achievable precision of simultaneous estimation. However, in multi-parameter sensing these bounds can become singular due to parameter interdependencies, limited probe accessibility, and insufficient measurement outcomes. Here, we first characterize the reasons which lead to singularities and then discuss how to overcome them. References: [1] Y. Yang, V. Montenegro, A. Bayat, Phys. Rev. Lett. 135, 010401 (2025) [2] G. Mihailescu, S. Sarkar, A. Bayat, S. Campbell, A. K. Mitchell, Quantum Sci. Technol. 11, 015006 (2026) [3] M Gutierrez, C. Mukhopadhyay, V. Montenegro, A. Bayat, arXiv:2511.04018

Venue: Physics C29