报告题目: 利用量子因果序实现超越海森堡极限的精密测量

报告摘要: The Heisenberg limit, corresponding to a root mean square error vanishing as N-1 with the number N of independent processes probed in an experiment, is widely believed to be an ultimate limit to the precision of quantum metrology. Here, we experimentally demonstrate a quantum metrology protocol surpassing the Heisenberg limit by probing two groups of independent processes in a superposition of two alternative orders. Each process creates a phase space displacement, and our setup achieves the super-Heisenberg limit N-2 in the estimation of a geometric phase associated to two sets of N displacements. In stark contrast with previous works, our results only require a single-photon probe whose initial energy is independent of N, and outperform every setup where the displacements are probed in a definite order.

报告人简介：陈耕，中国科学技术大学量子信息重点实验室教授，合肥国家实验室研究员。2010年于中国科学技术大学获得博士学位,师从郭光灿院士和李传锋教授, 研究领域为量子光学与量子信息。主要方向为基于光学系统的精密测量,相关工作发表在Nature Communications, Physical Review X, Physical Review Letters, Light: Science and Applications等国际知名期刊上。目前主持国家自然科学基金面上项目，重大研究计划培育项目，优秀青年科学基金项目。

主持联系人：王剑威(62767290)

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