応用物理学輪講 I
11月12日
[注意事項]
発表の10日前までに office[at]ap.t.u-tokyo.ac.jp 宛てに「氏名」「指導教員」「発表題目(英語)」「要旨(英語)」「発表言語(英語または日本語)」を送付して下さい。
発表日
2021年11月12日(金)16:50〜

Aグループ

座長
高原 規行
指導
教員名
川﨑 雅司 教授
座長
竹内 晴哉
指導
教員名
酒井 啓司 教授
発表者名 竹内 亮人
指導教員名 香取 秀俊 教授
発表題目(英語) Generation of ultracold atoms for continuous operation of optical lattice clocks
要旨(英語)  The performance of the optical lattice clock reaches the region of fractional uncertainty of 10^-18, which makes it possible to verify fundamental physics and apply it as a gravitational potential meter. The performance can be further improved by the continuous operation of the clock, but this requires the continuous generation of ultracold atoms, which has not been achieved in the past. In this presentation, we will introduce the conventional intermittent method for the generation of ultracold atoms and then describe the newly designed continuous one.
発表言語 日本語
発表者名 多屋 奏一
指導教員名 小林 洋平 教授
発表題目(英語) Development of a highly-sensitive mid-IR 2-dimensional imaging spectroscopy system aimed for instant disease detection with exhaled breath
要旨(英語)  Accurate specification of molecular species and their condensation in the gas is essential to applications represented by breath diagnosis. Each variety of molecule has typical absorption originated from stretching, angular, and rotational motion of its molecular bonds. Infrared(IR) is the optical spectrum region in which many of these absorptions, or “molecular fingerprints” are observed. Analyzing the absorption spectrum yields information of molecular types in the gas and their density. Formally, absorption spectrums of gases have been measured with FT-IR or dual optical frequency comb, whose disadvantage is data acquisition rate and its bulky system each. To replace these methods, we developed a 2-dimensional imaging spectroscopy system achieving both fast and precise spectrum acquisition, while its system is relatively compact.
 In my presentation, first, I will explain the Mid-IR 2-dimensional gas spectroscopy system using EGIG(Extremely-high-order Germanium Immersion Grating) and its short-pulse laser light source. Later, I will show a portion of experimental results obtained so far and their explanation. Finally, I will describe its applicational prospect.
発表言語 日本語
発表者名 土屋 叡本
指導教員名 小林 洋平 教授
発表題目(英語) Precise measurement of ablation threshold fluence of ps pulsewidth tunable laser to reveal the mechanism of laser processing
要旨(英語)  Laser ablation by ultrashort pulse laser has been a strong tool for processing materials non-thermally. However, the actual process of laser ablation has not been clarified, due to its complex mechanism. To obtain accurate and large amount of data, we have developed a laser ablating system that can give an quick feedback to its pulsewidth and fluence automatically.
 In this presentation, I will show the experimental results of the ablation threshold fluence measured by our laser ablating system, and discuss the mechanism of laser ablation in the timescale of the boundary region between the thermal and non-thermal effects.
発表言語 日本語

Bグループ

座長
武田 和大
指導
教員名
賀川 史敬 准教授
座長
津坂 裕己
指導
教員名
芦原 聡 教授
発表者名 冬鏡 澪
指導教員名 小芦 雅斗 教授
発表題目(英語) Matrix inversion by quantum singular value transformation and its optimization and estimation.
要旨(英語)  Quantum computing is seen as the next generation of computing, and some quantum algorithms are thought to be able to solve problems more efficiently than classical algorithms Recently, a method called quantum singular value transformation (QSVT) has been proposed, which can represent several quantum algorithms in a unified way. However, there is no concrete estimate of the problem size for which this method is faster than the classical computer after optimizing a specific quantum circuit. Also, there was no simple way to write this circuit as a program. In order to solve these problems, we first constructed a simple programming language that can easily describe the characteristic circuits in QSVT. We also optimized the most bottleneck part of matrix inversion to obtain a certain speedup, and then made a concrete estimate of the problem size at which the speedup over the classical computer is achieved.
発表言語 日本語
発表者名 友田 寛子
指導教員名 武田 俊太郎 准教授
発表題目(英語) Generation of optical quantum states with an arbitrary temporal mode
要旨(英語)  Universal optical quantum computers require some quantum states such as single-photon states, created using non-linear optical effects and photon detection. We usually utilize an optical parametric oscillator to strengthen a non-linear optical effect and this determines the temporal mode of quantum states. However, it is desired to create an arbitrary temporal mode due to an experimental reason and it has been an important issue.
 To solve this problem we propose an approach of using an optical parametric amplifier and modulating the pump light of it. In this presentation, I will introduce our method and talk about the recent evaluation results of the system.
発表言語 英語