权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Cooperative quantum optics in dense thermal vapours

稠密热蒸汽中的协同量子光学

基本信息

批准号：
EP/L023024/1
负责人：
Ifan Hughes
金额：
$ 98.55万
依托单位：
Durham University
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2014
资助国家：
英国
起止时间：
2014 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FL023024%2F1
关键词：
Cooperative quantum optics dense thermal

项目摘要

During this century there has been an explosion of research activity into manipulating individual quantum entities (single atoms, single ions, single photons...). This was the topic of the 2012 Nobel Prize in Physics, see http://www.nobelprize.org/nobel_prizes/physics/laureates/2012/. One of the great breakthroughs was that the mysterious quantum property of entanglement was identified not only as being at the heart of Einstein's "spooky action at a distance" but also as a resource for the emerging topic of quantum information processing. It is noteworthy that the fundamental theory and the technological breakthroughs advance in a symbiotic fashion. Specifically, there is a drive towards harnessing the powers of single quantum entities such as qubits in a quantum computer, which could yield computing devices with unprecedented power exploiting the exponential scale up of complexity in a quantum system.In the experiments described in this proposal we will produce pairs of photons which are entangled, by using our understanding of the interactions among hot atoms in a thermal vapour. We will also exploit a phenomenon known as "heralding" where for entangled photon pairs the presence of one photon can be triggered, or "heralded", by the presence of the other photon at a detector. Entangled photon pairs and heralded single photons will find great utility in the burgeoning fields of quantum information processing and quantum cryptography, in addition to fundamental tests of quantum mechanics. There are many possible sources of such useful photons which are currently being studied; the advantages offered by our scheme include simplicity (such that scalability - building many identical copies of key components of the apparatus - is not an issue), and the characteristics of the photons (their frequency (colour) and bandwidth (purity of colour)) are ideally suited to interface with quantum memories and quantum repeaters (also based on atomic ensembles).In addition to performing the research experiments we plan to disseminate our work further by incorporating a similar experiment into the teaching laboratories at our department, such that undergraduates can experiment with entangled photon pairs, and measure a violation of Bell's inequality. John Bell was a Physicist from Belfast who formulated a mathematical expression to encapsulate how "weird" quantum mechanics can be. A violation of Bell's inequality can not be explained by classical physics, but can be interpreted as spooky action at a distance. The results from our experiments will also be incorporated into talks for the public and schoolchildren given by the investigators.

在本世纪，操纵单个量子实体（单原子、单离子、单光子.）的研究活动激增。这是2012年诺贝尔物理学奖的主题，见http://www.nobelprize.org/nobel_prizes/physics/laureates/2012/。其中一个重大突破是，纠缠的神秘量子特性不仅被确定为爱因斯坦“幽灵般的远距离行动”的核心，而且还被确定为量子信息处理这一新兴课题的资源。值得注意的是，基础理论和技术突破以共生的方式前进。具体来说，有一种驱动力，利用量子计算机中的量子比特等单个量子实体的能力，这可能会产生具有前所未有的能力的计算设备，利用量子系统中复杂性的指数级增长。在本提案中描述的实验中，我们将利用我们对热蒸汽中热原子之间相互作用的理解，产生纠缠的光子对。我们还将利用一种被称为“预兆”的现象，其中对于纠缠光子对，一个光子的存在可以被探测器处另一个光子的存在触发或“预兆”。纠缠光子对和预示的单光子将在新兴的量子信息处理和量子密码学领域以及量子力学的基本测试中发现巨大的用途。目前正在研究的这种有用的光子有许多可能的来源;我们的方案提供的优点包括简单（使得可扩展性-构建设备的关键部件的许多相同副本-不是问题），光子的特性（它们的频率（颜色）和带宽）（颜色纯度））非常适合与量子存储器和量子中继器接口（也基于原子系综）。除了进行研究实验，我们计划通过将类似的实验纳入我们系的教学实验室，进一步传播我们的工作，这样，大学生就可以用纠缠光子对进行实验，并测量贝尔不等式的违反。约翰·贝尔是一位来自贝尔法斯特的物理学家，他用一个数学表达式来概括量子力学的“怪异”。违反贝尔不等式不能用经典物理学来解释，但可以解释为幽灵般的远距离作用。我们的实验结果也将被纳入调查人员为公众和学童举办的讲座中。