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KITANO, Masao

北野正夫

基本信息

批准号：
02650029
负责人：
KITANO Masao
金额：
$ 1.28万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650029/
关键词：
photon optical measurement quantum correlation photon pair quantum nondemolition measurement スクイズ状態

项目摘要

The purpose of this research project is applications of photon pairs to high-sensitive optical measurements. The photon pair generated through parametric down-conversion shows strange behaviors that cannot be understood in terms of classical theories. Especially the simultaneity of each pair can be utilized for generation of photon-number eigenstates. The summary of this project is as follows :1. Theory for quantum-correlation of photon pairs Conventionally the quantum field theory is used in the study of photon pairs. In that approach, however, it is not easy to obtain intuitive pictures for photon correlations and the higher-order interference. As an alternative approach, we have introduced the two-photon wavefunction which obeys Schrodinger's equation. In this view, the photon pair behaves as a wave in a two dimensional configuration space. The bosonic wave has to be symmetrized according to the Leinass-Myrheim method. Using the two-photon wave function, we could obtain a unified view for various two-photon correlation phenomena. It turned out that the bosonic symmetry and the spectral property of parametric fluorescence contribute to the quantum correlation. We have also seen some analogies between photon pairs and two-electron systems such as helium atoms and organic dyes.2. Quantum non-demolition measurement of photon number with light shift We first planned experiments on photon pairs generated by parametric down-conversions. In the course of research, however, we came to a new scheme of quantum non-demolition measurement of photon number. Thus we switched to the experiments in order to verify our scheme. The principle is based on the atomic level shifts due to the virtual transition induced by the light to be measured. In the preliminary experiment we could measure the light intensity without the absorption. Although the sensitivity so far reached is too low to detect the quantum noise, we hope our scheme will be extended to a real QND measurement.

本研究计画的目的是将光子对应用于高灵敏度的光学量测。通过参量下转换产生的光子对表现出无法用经典理论理解的奇怪行为。特别是每一对的双光子性可以用来产生光子数本征态。本课题的主要内容如下：1.光子对的量子关联理论通常用量子场论来研究光子对。然而，在这种方法中，不容易获得光子相关性和高阶干涉的直观图像。作为另一种方法，我们引入了服从薛定谔方程的双光子波函数。在这个观点中，光子对表现为二维组态空间中的波。玻色子波必须根据Leinass-Myrheim方法对称化。利用双光子波函数，我们可以对各种双光子关联现象得到统一的认识。结果表明，玻色对称性和参量荧光的光谱特性对量子关联有贡献。我们还看到了光子对和双电子系统之间的一些类比，如氦原子和有机染料。光子数随光移的量子非破坏测量我们首先计划对参量下转换产生的光子对进行实验。但在研究过程中，我们提出了一种新的量子非破坏测量光子数的方案。因此，我们切换到实验，以验证我们的计划。该原理基于由待测光引起的虚跃迁引起的原子能级位移。在初步实验中，我们可以测量没有吸收的光强度。虽然目前所达到的灵敏度太低，无法检测到量子噪声，但我们希望我们的方案能推广到真实的量子噪声测量。