成大物理系徽
量子資訊專題演講
演講題目: Applications Of Optical Quantum - Spectroscopy And Quantum Information
演講人: Prof. Atsushi Yabushita
Department of Physics, University of Tokyo
演講時間: 2006 年 11 月 27 日
星期一  上午 12 : 00
演講地點: 物理二館 二樓研討室(49223)
內容摘要:  
Abstract :
Spontaneous parametric down conversion (SPDC) in a nonlinear crystal generates photon pairs, entangled in various parameters. Their polarization entanglement used for various quantum information experiments, like quantum teleportation, quantum key distribution (QKD), etc. Their wave vector entanglement has been used in quantum imaging, quantum lithography and so on.
In this talk, we are going to report three topics about the application of the entanglement of the SPDC photon pairs. First topic is about the application of their frequency entanglement for spectroscopy. Frequency correlation in each photon pair enabled us to perform absorption spectroscopy of a sample without frequency resolving the transmission spectrum. In the second topic, we analyze two-photon quantum interference of collinear SPDC photon pairs in Michelson interferometer. Third topic is the quantum key distribution with a heralded single photon source (HSPS) with a photon number resolving detection system. It enables us to operate QKD in a longer distance than the case when we use weak coherent pulselight (WCP).