ITR: Quantum Information and Communication Using Massive Etanglement of Collective Variables

量子信息(QI)、通信和计算的核心概念是量子纠缠。QI领域的一项重要任务是发展控制未知量子态并将其从一个系统传输到另一个系统的能力，并在不同的量子系统之间创建纠缠，特别是在第二个系统位于某个遥远位置的情况下。目前的大多数量子信息网络方案依赖于耦合通过光子通道的量子信息流，同时使用大质量粒子系统来存储和操纵量子信息。最近，大量的注意力转向了一种新的可能性：使用连续的、集体的量子变量来应用于量子信息。基于这一概念的原子纠缠方案具有一个吸引人的特点，即只使用简单的半导体激光器产生的相干激光，就可以在数百万个原子的蒸气中实现连续可变纠缠。该奖项支持的研究项目就是基于这样一个方案，即基态中性原子的自旋纠缠。这项工作致力于研究纠缠过程的各个基本方面，以及它在纠缠波长复用等问题上的应用。随着光学和电子系统的小型化，量子力学自然会成为信息工程的一个基本特征。因此，对量子系统的研究必须是开发纳米科学信息技术工具这一国家目标的组成部分。

Central to the concepts of quantum information (QI), communication and computation is the idea of quantum entanglement. An important task for the QI field is to develop the ability to control and transmit an unknown quantum state from one system to another and to create entanglement between separate quantum systems, particularly for the case where the second system is at some distant location. Most current quantum information network schemes rely on coupling quantum information flow through photonic channels while using massive particle systems for quantum information storage and manipulation. Recently, a great deal of attention has turned to a new possibility: the use of continuous, collective quantum variables for quantum information applications. An atomic entanglement scheme based on this concept has the attractive feature that continuous variable entanglement is realized in a vapor of many millions of atoms using simple set-ups using only coherent laser light generated from simple diode lasers. The research project supported by this award is based on such a scheme, the entanglement of spins of ground-state neutral atoms. The work is dedicated to studying various fundamental aspects of the entanglement process and its application to problems such as entangled wavelength multiplexing. As optical and electronic systems are miniaturized to smaller and smaller scales, it is natural that quantum mechanics will become an essential feature of information engineering. Hence, studies of quantum systems must be an integral part of the national goal of developing tools for nanoscience information technologies.