Quantum Optics with Polariton Condensates

极化子凝聚体的量子光学

• 批准号: 1205762
• 负责人: David Snoke
• 金额: $ 42.5万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-08-15 至 2016-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1205762&HistoricalAwards=false
• 关键词: Quantum; Optics; Polariton; Condensates

Creating Bose condensates of polaritons in microcavity structures is now fairly routine. In addition, we now have structures which have very long polariton lifetime compared to their thermalization time, so that we can do experiments with equilibrated condensates of these particles. This project has three primary goals based on our ability to make long-lifetime polariton condensates. First, we plan to use a polariton condensate to create enhanced two-photon absorption. In principle, this enhancement can be so much that the two-photon absorption process becomes deterministic even for sets of two single photons. This would have immediate impact in the area of quantum optics. The second main goal is to map the phase diagram of an equilibrium polariton condensate as a function of density and temperature, with emphasis on the changes of the spectral function of the condensate, which is immediately observable to us. In addition, we plan to create intersecting beams of ballistic polaritons, which would allow us to do many polariton-polariton scattering studies.Bose condensation is a ubiquitous effect in which many particles spontaneously organize to act collectively as a single wave. The most well known example of this is a gas of atoms at ultra-low temperatures, but the effect occurs in other systems as well. In recent years, it has been shown to occur at moderate temperatures (tens of Kelvin) with particles called "polaritons", which are essentially photons that have been given atom-like properties, namely mass and weak interactions, by means of a specially designed optical system. A main goal of this project is to use a Bose condensate of polaritons to manipulate the transmission of infrared photons. If this goal succeeds, we will have a system in which one photon passing through the system will be unaffected, but two photons passing through together will be absorbed. This ability to manipulate single photons can be used in a number of schemes of quantum optical communications. The project will be tremendous experience for graduate students working on the project to do cutting edge optics research.

现在，在微博结构中创建极化子的玻色冷凝物是相当常规的。此外，我们现在的结构与它们的热化时间相比具有很长的polariton寿命，因此我们可以使用这些颗粒的平衡冷凝物进行实验。该项目具有三个主要目标，基于我们制造长期二极化凝聚力的能力。首先，我们计划使用偏振子冷凝物创建增强的两光子吸收。原则上，这种增强可能是如此之多，即使对于两个单个光子的集合，两光子吸收过程也变得确定性。这将在量子光学元件领域立即产生影响。第二个主要目标是绘制平衡偏振子凝结物的相图作为密度和温度的函数，重点是凝结物的光谱功能的变化，这是我们立即可观察到的。此外，我们计划创建相交的弹道极性束，这将使我们能够进行许多Polariton-Polariton散射研究。肉体凝结是一种无处不在的效应，其中许多颗粒自发地组织起来以单个波的统一起作用。最著名的例子是在超低温度下原子的气体，但效果也发生在其他系统中。近年来，它已显示出在中等温度（数十个开尔文）的情况下发生的，其颗粒被称为“ polaritons”，这些粒子本质上是通过特殊设计的光学系统赋予原子样性能的光子，即质量和弱相互作用。该项目的一个主要目标是使用极地的玻色冷凝物来操纵红外光子的传输。如果这个目标成功，我们将拥有一个系统，其中一个光子通过该系统将不受影响，但是两个光子一起通过，将被吸收。这种操纵单光子的能力可用于许多量子光学通信方案。对于从事该项目的研究生进行尖端光学研究的研究生，该项目将是丰富的经验。