报告摘要：Fast and high-fidelity nondemolition qubit readout (e.g., dispersive and longitudinal)

is a prerequisite for quantum error correction and fault-tolerant quantum computation, while squeezed light is powerful resource in modern quantum technologies. However, longitudinal qubit readout can be exponentially improved by injected external squeezing (IES), but cannot by intracavity squeezing (ICE). Here, I would like to first briefly introduce degenerate parametric amplifier, a typical device used to produce squeezed light. After this, I would like to talk about a protocol of using ICE to exponentially improve longitudinal qubit readout, and then how to use IES and ICS together to exponentially improved dispersive qubit readout。

报告人介绍：秦伟，天津大学北洋计划英才教授，入选国家级青年人才项目。2009年于烟台大学获学士学位 ，2014年博士毕业于清华大学物理系。先后在北京计算科学研究中心、日本理化学研究所从事博士后研究，2023年10月加入天津大学理学院物理系。研究领域为量子信息与量子光学，目前主要开拓压缩光在量子精密测量，量子纠错编码等领域的新应用。已发表论文40余篇，包括1篇Phys. Rep.受邀长篇综述，7篇Phys. Rev. Lett.等。谷歌学术引用1800余次，多项理论预言被包括诺贝尔物理学奖获得者D. J. Wineland教授在内的国际同行的实验验证。