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Implementation of Highfield W-Band Quantum-Phase Controlled FT Pulsed Electron Magnetic Resonance for Molecular Spinics

高场 W 波段量子相控 FT 脉冲电子磁共振在分子自旋学中的实现

基本信息

批准号：
10304049
负责人：
TAKUII Takeji
金额：
$ 22.47万
依托单位：
Osaka City University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10304049/
关键词：
Pulse-based electron magnetic resonaznce Magnetic dipolar spinwave Quantum phase control Molecular spinics Molecular magnetism Organic magnetism Quantum information processing Quantum computer 分子スピークス高磁場ESR パルスESR 量子位相 Wバンド電子磁気共鳴

项目摘要

During the research period, the implementation of highfield W-band quantum-phase controlled FT pulsed electron magnetic resonance for molecular spinics was carried out from both theoretical and experimental sides. The main purpose of the research project was to establish the methodology in terms of electron magnetic resonance for controlling quantum phases of both electron spins and nuclear spins in molecular frames such as organic open-shell systems. The quantum phase control is essential to build up any quantum computers or quantum information processing systems based on spin qubits. Particularly, the manipulation of electron phases has been intractable in terms of magnetic resonance spectroscopy. In this project, the phases between two addressable electron spins in organic high spins have been controlled for the first time. The corresponding experimental setup has been based on pulsed electron-electron double resonance technology operating at Q-band, attempting to up-convert the microwave frequency to W-band. Several important experiments for quantum computing and quantum information processing such as super-dense coding or inter-conversion between Bell states composed of electron/nuclear qubits as synthetic qubits in molecular frames have been for the first time achieved at low temperature. The approach established in the project is applicable to the extension to multiple-frequency versions, but it costs enormously. The technical innovation was attempted by using arbitrary wave generation based on high-frequency digital technology operating at low microwave frequency regions. In the alternative approach, the number of microwave frequencies, their relative phase and amplitudes are able to controlled. Also, during the research project, molecular design for scalable electron/nuclear spin qubits and their synthetic attempt have been carried out, aiming at building up "practical" quantum computers and quantum information processing systems.

在研究期间，从理论和实验两个方面开展了W波段量子相位控制FT脉冲电子磁共振分子自旋的研究。该研究项目的主要目的是建立电子磁共振方面的方法，以控制有机开壳层系统等分子框架中电子自旋和核自旋的量子相位。量子相位控制是构建任何基于自旋量子比特的量子计算机或量子信息处理系统的关键。特别是，电子相位的操纵在磁共振波谱学方面一直是棘手的。在该项目中，首次控制了有机高自旋中两个可寻址电子自旋之间的相位。相应的实验装置基于工作在Q波段的脉冲电子-电子双共振技术，试图将微波频率上变频到W波段。量子计算和量子信息处理的几个重要实验，如超密集编码或分子框架中的电子/核量子比特作为合成量子比特组成的Bell态之间的相互转换，首次在低温下实现。本项目所建立的方法适用于多频版本的扩展，但成本高昂。该技术创新尝试使用基于在低微波频率区域操作的高频数字技术的任意波生成。在另一种方法中，微波频率的数量、它们的相对相位和幅度能够被控制。此外，在该研究项目中，还进行了可扩展电子/核自旋量子比特的分子设计和合成尝试，旨在建立“实用”的量子计算机和量子信息处理系统。