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Retrieving ideal precision in noisy quantum metrology

创建于2019年07月01日 星期一作者 : 科研办 浏览量 :

主讲人:安钧鸿,兰州大学教授
时  间:2019年7月1日10:00
地  点:物电学院A栋219
联系人:童庆军

讲座摘要:Quantum metrology allows us to attain a measurement precision that surpasses the classically achievable limit by using quantum characters. The metrology precision is raised from the classical shot-noise limit (SNL) to the Heisenberg limit (HL) in the atomic Ramsey spectroscopy by using entanglement and to the Zeno limit (ZL) in the optical Mach-Zehnder interferometer by using squeezing. However, it was reported that the two limits in both of the setups returns to the SNL in the presence of local environments under the long encoding-time condition. This is called the no-go theorem for noisy quantum metrology. In this talk, I will introduce our study on evaluating the exact impacts of local dissipative environments on quantum metrology in the atomic Ramsey spectroscopy and optical Mach-Zehnder interferometer. We propose a mechanism to overcome this ostensible no-go theorem. It is found that the two ideal precisions are asymptotically recoverable under the long encoding-time condition for the two setups, respectively, as long as a bound state between the atom or the optical-field and its environment is formed. This provides an avenue for experimentation to implement quantum metrology under practical conditions via engineering of the formation of the system-environment bound state.

主讲人简介:安钧鸿,教授,博士生导师。2005年在兰州大学获得博士学位并留校工作。2006年至2014年相继在台湾成功大学和新加坡国立大学开展博士后和合作科研。2013年入选教育部新世纪优秀人才支持计划;2016年入选甘肃省飞天学者;2017年入选中央军委科技委主题专家组专家;2018年入选中国物理学会量子光学专业委员会委员;2019年入选国家“万人计划”青年拔尖人才。主要从事量子物理基础问题研究,包括量子光学、量子信息、量子相变以及非平衡量子统计动力学等方面的研究。主持在研/完成国家自然科学基金5项、教育部博士点基金和甘肃省自然科学基金各1项。