Haidong Yuan

Jan 13, 2025 | nature.com | Qing Li |Lingna Wang |Min Jiang |Haidong Yuan

AbstractPrevious studies in quantum information have recognized that specific types of noise can encode information in certain applications. However, the role of noise in quantum hypothesis testing, traditionally assumed to undermine performance, has not been thoroughly explored. Our study provides sufficient conditions for general noisy dynamics to surpass noiseless (unitary) dynamics within certain time interval.

Feb 9, 2024 | link.aps.org | Yu Yang |Quantum Optoelectronic Devices |Xi'an Jiaotong |Haidong Yuan

Abstract In quantum multiparameter estimation, multiple to-be-estimated parameters are encoded in a quantum dynamics system by a unitary evolution. As the parameters vary, the system may undergo a topological phase transition (TPT). In this paper, we investigate two SU(2) TPT models and propose the singular behavior of the quantum metric tensor around the TPT point as a tool for the simultaneous optimal estimation of multiple parameters.