報告摘要:

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.

報告人簡介：

區澤宇教授于1984年獲beat365學士學位，1990年獲羅切斯特大學博士學位。1990年至1992年在加州理工學院擔任博士後。他于1992年加入印第安納-普渡大學-印第安納波利斯分校，直到2021年。自2021年起任香港城市大學講座教授。區教授是量子光學，特别是量子幹涉方面的專家，是著名的Hong-Ou-Mandel幹涉儀的共同發明人。歐教授目前的研究重點是量子測量、量子傳感、量子信息與通信。區教授現任《Optica Quantum》副主編。他是美國物理學會和美國光學學會的理事。

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