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QLC: EAGER: Collaborative Research: Dissecting many-body correlations in matter by quantum process tomography

QLC：EAGER：协作研究：通过量子过程断层扫描剖析物质中的多体相关性

基本信息

批准号：
1836080
负责人：
Eric Bittner
金额：
$ 4.31万
依托单位：
University of Houston
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-08-15 至 2020-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1836080&HistoricalAwards=false
关键词：
QLC EAGER Collaborative Research Dissecting

项目摘要

One of the most fundamentally important problems in chemistry is to understand how electrons behave in molecules. Chemists often exploit the interaction of light with such electrons to deduce this information. Interaction with light may also provide profound information on how molecules interact each other in liquids and solids. For example, inter-molecular interactions dictate how fast electrons lose the energy transferred to them by light, and how fast they forget about the process of light absorption. Nevertheless, the details of how these properties depend on electronic interactions with all other electrons in liquids and solids is not always easily extractable using light that can be completely described with classical physics. In this project funded by the Chemical Structure Dynamics and Mechanism (CSDM-A) program of the Chemistry Division, Professors Carlos Silva of the Georgia Institute of Technology and Eric Bittner of the University of Houston are developing techniques that take advantage of light that obeys quantum mechanics to overcome these limitations. Specifically, they exploit entanglement of exactly two light particles (photons) at a time. Entanglement means that it is fundamentally impossible to distinguish between the properties of identical particles, regardless of how far they are from each other. The properties of the two entangled photons are measured after one of the two interacts with electrons in molecules. This approach provides new tools for chemists to understand the details on how electrons in different molecules talk to each other in order to dictate important collective behavior in liquids and solids. In addition to the scientific and technical innovations involved in this research, it serves as a training platform to contribute to the intellectual capital and scientific infrastructure of the US, in which quantum technologies is growing in significance. Technical description: Quantum process tomography is developed as a novel materials optical probe, with clear potential to isolate details of many-body and multi-quantum interactions with unique selectivity with respect to classical nonlinear spectroscopy and contemporary quantum spectroscopies. After one photon in a polarization-entangled pair interacts with a sample, the change in entanglement entropy the degree to which the initially pure state becomes a mixed quantum state is quantified. This change is driven by nonlinear processes in the sample. The objectives for this project are (i) to implement a versatile time-tagged quantum-process tomography setup to investigate multi-quantum processes in conjugated molecules and polymers, and (ii) to develop a theoretical formalism invoking the quantum-optical nature of the technique and the effect on the entangled biphoton state of the many-body physics intrinsic to the material.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

化学中最基本的重要问题之一是了解电子在分子中的行为。化学家经常利用光与这些电子的相互作用来推断这一信息。与光的相互作用还可以提供关于分子如何在液体和固体中相互作用的深刻信息。例如，分子间的相互作用决定了电子失去光传递给它们的能量的速度，以及它们忘记光吸收过程的速度。然而，这些性质如何取决于电子与液体和固体中所有其他电子的相互作用的细节并不总是很容易用经典物理学完全描述的光来提取。在这个由化学系化学结构动力学和机制（CSDM-A）项目资助的项目中，格鲁吉亚理工学院的卡洛斯席尔瓦教授和休斯顿大学的埃里克比特纳正在开发利用服从量子力学的光来克服这些限制的技术。具体地说，他们一次只利用两个光粒子（光子）的纠缠。纠缠意味着从根本上不可能区分相同粒子的性质，无论它们彼此相距多远。在两个纠缠光子中的一个与分子中的电子相互作用后，测量两个纠缠光子的性质。这种方法为化学家提供了新的工具，以了解不同分子中的电子如何相互交谈的细节，以决定液体和固体中的重要集体行为。除了这项研究涉及的科学和技术创新之外，它还作为一个培训平台，为美国的智力资本和科学基础设施做出贡献，在美国，量子技术的重要性日益增长。技术说明：量子过程层析成像是一种新型材料光学探针，相对于经典非线性光谱和现代量子光谱，它具有独特的选择性，可以分离多体和多量子相互作用的细节。在一个偏振纠缠对中的一个光子与一个样品相互作用后，纠缠熵的变化，即初始纯态变成混合量子态的程度被量化。这种变化是由样品中的非线性过程驱动的。本计画的目标是：（i）建立一套多功能的时间标记量子过程层析成像装置，以研究共轭分子和聚合物中的多量子过程，和（ii）发展一种理论形式主义，调用该技术的量子光学性质和对多光子纠缠双光子态的影响，该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。