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Development of wave-packet interference control with an attosecond accuracy and is application to quantum computing

开发出阿秒级精度的波包干涉控制并应用于量子计算

基本信息

批准号：
13440120
负责人：
OHMORI Kenji
金额：
$ 9.54万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13440120/
关键词：
wave packet attoseconds quantum interference coherent control quantum information quantum phase molecule quantum computer 純粋状態

项目摘要

Quantum phase manipulation of wave functions opens a novel technology through "coherent control" such as quantum computing and bond selective chemistry. One promising approach is to use coherent light to modulate a wave function with its optical phase. For example, irradiating a diatomic molecule with a femtosecond (fs) optical pulse, with bandwidth broad enough to cover several vibrational eigenstates, coherently superpose those eigenstates to yield a spatially localized wave function called a nuclear "wave packet (WP)" traveling back and forth along the bond axis. In the generalon of this WP, the phase of an optical field is imprinted on the WP as its quantum phase. Hence engineering the optical phase with an accuracy better than the optical cycle allows us to engineer the phase of the WP with the same accuracy.We have developed the "attosecond phase modulator", by which we can manipulate the relative phase of two fs laser pulses with an accuracy of 7 attoseconds. This phased pair of fs laser pulses has been used to realize unprecedented high-resolution interference of two nuclear WP's moving in a single Hg-Ar molecule where its fringe contrast is almost 100 %, demonstrating a pure wave nature of heavy particles.This high-resolution WP interference has been utilized to encode 9 typical trinary codes into a 3 tritquantum reglster assembled within a single molecule as nodal patterns of a WP. In principle it can be used for fhe storage of the phase information contained in an optical field. Moreover, by using this WP interference control, we have developed a high-precision phase shiffer operated on a qubitorqutrit composed of coherent superposition of two or three vibrational eigenstates within a single molecule. The present studies indicate a possibility of large-sale quantum computing using many vibrational eigenstates within a single molecule.

波函数的量子相位操纵通过量子计算和键选择化学等“相干控制”开辟了一种新技术。一种很有前途的方法是使用相干光来调制波函数及其光学相位。例如，用飞秒（fs）光脉冲照射双原子分子，其带宽足以覆盖几个振动本征态，将这些本征态相干地叠加在一起，产生一个空间局域波函数，称为核“波包（WP）”，沿着键轴来回传播。在此WP的一般情况下，光场的相位作为其量子相位印在WP上。因此，以比光周期更好的精度设计光相位使我们能够以相同的精度设计WP的相位。我们开发了“阿秒相位调制器”，通过它我们可以以7阿秒的精度操纵两个fs激光脉冲的相对相位。利用fs激光脉冲相控对实现了两个核WP在单个Hg-Ar分子中运动的前所未有的高分辨率干涉，其条纹对比度几乎达到100%，证明了重粒子的纯波性质。这种高分辨率的WP干扰已被用于将9个典型的三进制编码编码到一个3三量子寄存器中，该寄存器作为WP的节点模式组装在单个分子中。原则上，它可用于存储光场中包含的相位信息。此外，通过使用这种WP干涉控制，我们开发了一种高精度的移相器，该移相器运行在单个分子内由两个或三个振动本征态的相干叠加组成的量子量子上。目前的研究表明，利用单个分子内的多个振动本征态进行大规模量子计算是可能的。