报告摘要:

Interferometry has been widely used in sensing application for precision measurement of a variety of physical quantities. However, the hardware structure and the measurement technique have not changed ever since its invention about one hundred years ago, even though quantum states are employed to reduce the intrinsic quantum noise in the interferometers. This has limited the applicable range of the traditional interferometric technique. For example, the interference paths must be balanced to within the coherence time of the light sources. In this presentation, we will introduce some new quantum approaches to interferometry. Among them is the approach by hardware changes. We will review a number of quantum advantages over traditional methods. Another one is the adoption of quantum measurement technique. This can break the limitation of finite coherence time in traditional interferometry and broaden the applicable range of interferometric techniques.The latter approach has potential applications in long-baseline high resolution astronomy and LIDAR technique. In addition to practical applications, when the method is applied to single-photon state as input, this unconventional phenomenon has fundamental implication on the complementarity principle of quantum interference.

报告人简介：

区泽宇教授于1984年获永利集团学士学位，1990年获罗切斯特大学博士学位。1990年至1992年在加州理工学院担任博士后。他于1992年加入印第安纳-普渡大学-印第安纳波利斯分校，直到2021年。自2021年起任香港城市大学讲座教授。区教授是量子光学，特别是量子干涉方面的专家，是著名的Hong-Ou-Mandel干涉仪的共同发明人。欧教授目前的研究重点是量子测量、量子传感、量子信息与通信。区教授现任《Optica Quantum》副主编。他是美国物理学会和美国光学学会的理事。

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