[原分所] 01/15(Tue.) IAMS Lecture Announcement--Dr. Shau-Yu Lan 藍劭宇博士
截止日期：2013-01-15
IAMS Lecture Announcement中研院原分所演講公告
Title: Atom Interferometry Experiments for Precision Measurement of Fundamental Physics
Speaker: Dr. Shau-Yu Lan 藍劭宇博士 (Department of Physics, UC Berkeley, USA)
Time: 10:00AM, January 15 (Tuesday)
Place: Dr. Poe Lecture Hall, IAMS (原分所浦大邦講堂 臺大校園內)
Contact: Dr. Wei-Hua Wang 王偉華博士
Abstract:
Light-pulse atom interferometers have already been used as quantum inertial sensors and to test the fundamental physics with high precision and accuracy. In this talk, I will first give an overview of light-pulse atom interferometers and demonstrate our recent developments of high sensitive interferometers using large-momentum transfer beam splitters, common mode rejection, and Coriolis force compensation. Combining with an optical frequency comb, I will present the first clock referenced the mass of a single particle only. The rest mass of a particle defines its Compton frequency, mc2/ћ through relativity and quantum mechanics, and thereby sets a fundamental timescale. However, the Compton frequency of a single, non-interacting particle is too high to be harnessed as a clock (about 3×1025 Hz for a cesium atom) and does not directly give rise to observable effects. The relative phase accumulated between matter-waves travelling along different paths provides us with an indirect way to access the Compton frequency. Our clock stabilizes a radio-frequency signal to a certain fraction of the Cs Compton frequency. I will also give you an update of our recent progress on a new determination of fine structure constant reaching sub-ppb level using large momentum transfer atom interferometers.
Title: Atom Interferometry Experiments for Precision Measurement of Fundamental Physics
Speaker: Dr. Shau-Yu Lan 藍劭宇博士 (Department of Physics, UC Berkeley, USA)
Time: 10:00AM, January 15 (Tuesday)
Place: Dr. Poe Lecture Hall, IAMS (原分所浦大邦講堂 臺大校園內)
Contact: Dr. Wei-Hua Wang 王偉華博士
Abstract:
Light-pulse atom interferometers have already been used as quantum inertial sensors and to test the fundamental physics with high precision and accuracy. In this talk, I will first give an overview of light-pulse atom interferometers and demonstrate our recent developments of high sensitive interferometers using large-momentum transfer beam splitters, common mode rejection, and Coriolis force compensation. Combining with an optical frequency comb, I will present the first clock referenced the mass of a single particle only. The rest mass of a particle defines its Compton frequency, mc2/ћ through relativity and quantum mechanics, and thereby sets a fundamental timescale. However, the Compton frequency of a single, non-interacting particle is too high to be harnessed as a clock (about 3×1025 Hz for a cesium atom) and does not directly give rise to observable effects. The relative phase accumulated between matter-waves travelling along different paths provides us with an indirect way to access the Compton frequency. Our clock stabilizes a radio-frequency signal to a certain fraction of the Cs Compton frequency. I will also give you an update of our recent progress on a new determination of fine structure constant reaching sub-ppb level using large momentum transfer atom interferometers.