报告时间：5月16日下午4点

报告地点：近代物理系509会议室

报告人：香港中文大学 袁海东教授

报告题目：Noise-enhanced quantum metrology

报告摘要：Standard schemes in quantum parameter estimation typically assume the parameter to be estimated residing in one part of the dynamics, either in the Hamiltonian or in the noisy operator, for such scheme the Heisenberg limit is the ultimate precision limit. Here we explore the interplay between coherent controls and the noises and show that such interplay can create multiple paths for parametrization, which opens new possibilities and can be exploited to further improve the precision limit. We demonstrate the rich dynamics offered by the cooperation between coherent controls and the noises through a few examples and show that in certain regions the precision limit under such dynamics can surpass the precision limit under ideal unitary dynamics.