【时  间】2023年10月16日（周一） 上午 10:00

【地  点】量子院320报告厅

【主  持】尤  力  量子院相干原子系统的量子测量与操控团队负责人，清华澳门威尼克斯人网站教授

【题  目】Strong metrological limit from many-body physics

【摘  要】Surpassing the standard quantum limit and even reaching the Heisenberg limit using quantum entanglement, represents the Holy Grail of quantum metrology. However, quantum entanglement is a valuable resource that does not come without a price. The exceptional time overhead for the preparation of large-scale entangled states raises disconcerting concerns about whether the Heisenberg limit is fundamentally achievable. Here, we find a universal speed limit set by the Lieb-Robinson light cone for the quantum Fisher information growth to characterize the metrological potential of quantum resource states during their preparation. Our main result establishes a strong precision limit of quantum metrology accounting for the complexity of many-body quantum resource state preparation and reveals a fundamental constraint for reaching the Heisenberg limit in a generic many-body lattice system with bounded one-site energy. It enables us to identify the essential features of quantum many-body systems that are crucial for achieving the quantum advantage of quantum metrology, and brings an interesting connection between many-body quantum dynamics and quantum metrology.

【报告人简介】储耀明，2017年和2022年分别本科和博士毕业于华中科技澳门威尼克斯人网站物理澳门威尼克斯人网站；目前仍继续在华中科技澳门威尼克斯人网站物理澳门威尼克斯人网站从事博士后，主要致力于量子传感相关理论与方法的研究，已在物理学期刊发表SCl论文9篇，其中包括Phys. Rev. Lett. 4篇。