Novel Spontaneous Four-wave Mixing Techniques for Photon-pair Generation and Hyperentanglement

纠缠在许多量子信息协议中起着至关重要的作用。该项目将帮助研究人员利用新型自发四波混频技术理解和控制纠缠和超纠缠的产生。研究人员在光纤中产生超纠缠的工作也将使一种新型的量子信息编码成为可能，这是朝着增强单个光子携带的信息容量，从而实现更快的安全通信迈出的一步。他们开发了一种探测超纠缠的有效技术，这将使其他研究人员能够快速精确地设计用于量子应用的光子对源。这项通过拉曼相互作用产生光子对的研究有望阐明光子产生的过程，从而实现一种更适合量子计算、量子通信和精密传感等量子应用的新型光子对源。为了帮助公众了解光的量子性质，研究人员将为伊利诺伊大学物理大楼大厅和工程开放日开发一个展示装置，说明波粒二象性的概念。他们还将举办公开讲座，并介绍课程材料，让本科生深入了解光的量子特性。该研究还将为量子光学的研究生和本科生提供专业培训。由于光子对源在量子研究和量子应用中的普遍使用，人们一直在努力开发新的源，以产生特定应用所需的量子态的光子。研究人员将开发一种基于晶体材料中的拉曼相互作用的新型光子对源，其中光子的发射是由声子的共振激发介导的，从而影响光子的光谱特性，这一过程与传统的自发参数下转换（SPDC）或自发四波混频（SFWM）技术不同。具体来说，研究人员希望这一过程能够自然地减少光子对内的光谱相关性，而不是像SPDC和SFWM那样，必须使用特殊的工程技术，通常会导致不满意的结果。他们预计研究界将在其他拉曼系统中找到新开发的原理的进一步用途。该奖项反映了美国国家科学基金会的法定使命，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。

Entanglement plays a crucial role in many quantum information protocols. This project will help researchers understand and control the generation of entanglement, and hyperentanglement, using novel spontaneous four-wave mixing techniques. The researchers' work on hyperentanglement generation in an optical fiber will also enable a new type of quantum information encoding, which is a step towards enhancing the information capacity carried on a single photon and thus allowing faster secure communication. Their development of an efficient technique for probing hyperentanglement will enable other investigators to quickly and precisely engineer photon-pair sources for quantum applications. This research on photon-pair generation via Raman interaction is expected to clarify the process in which the photons are created, towards the realization of a new type of photon-pair source that is better suited for quantum applications such as quantum computation, quantum communication and precision sensing. To help inform the public about the quantum nature of light, the investigators will develop a display illustrating the concept of wave-particle duality for the University of Illinois physics building lobby and engineering open house. They will also present public outreach lectures and introduce course material that gives undergraduate students insight into the quantum properties of light. The research will also provide professional training to graduate and undergraduate students in quantum optics.Due to the ubiquitous use of photon-pair sources in quantum research and quantum applications, there have been major efforts to develop novel sources that produce photons in specific application-required quantum states. The investigators will develop a new type of photon-pair source based on the Raman interaction in crystalline materials, wherein the emission of photons is mediated by resonant excitation of a phonon, thus affecting the photon spectral properties in a way that differentiates this process from the traditional techniques of spontaneous parametric downconversion (SPDC) or spontaneous four-wave mixing (SFWM). Specifically, the researchers expect this process to naturally reduce spectral intra-correlations within the photon-pair, as opposed to SPDC and SFWM, for which special engineering techniques must be used that often result in unsatisfactory outcomes. They anticipate the research community will find further use for the newly developed principles in other Raman systems.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.