Strong-Coupling of Quantum Dots and Micro-cavities for Efficient Single and Double Photon Sources and Quantum Logic

0323141Raymer PI将实现一种新的方法，利用单个半导体量子点(QD)和光学微腔的模式来达到腔-QED强耦合区域。这种尚未在任何实验室实现的耦合，意味着单个光子可以强烈地驱动量子点，从激发态量子点发出的辐射将确定性地主要发生在光场的单模中。这种在单量子水平上的极端控制程度将潜在地使PI能够在量子信息处理中开发几个有用的应用：1.按需确定性地产生单光子(用于确保量子密码学的安全性)；2.将量子信息写入和读出材料系统；3.按需确定性地产生多对偏振纠缠光子(用作量子通信或线性光学计算的资源)；4.量子信息处理或计算。近期的目标是证明我们实验室已经建立的外腔系统将在量子点和光腔模式之间提供足够水平的相干耦合，以满足基于量子点的量子信息处理(QIP)的要求。第三年供资期间的第二个目标将是上述项目1和2。如果量子技术真的变得可操作，这项研究将有助于通信技术的潜在革命。这里的研究将有助于开发高效的单光子和光子对固态源，以及操纵这些系统中的电子和自旋态以进行量子计算所需的单量子点的相干控制。量子信息科学很受研究生和本科生的欢迎。它正在吸引学生参与研究。本科生，包括男性和女性，都参与了这个项目。该项目还吸引了来自国外的来访科学家和学生，为学生提供了一种拓宽文化的体验。这些材料正在进入本科生和研究生的课程。PI最近在本科非理科专业层面发起并教授了一门新课程，名为《互联网背后的物理》，他最近为这门课程编写了一本教科书。

0323141RaymerThe PI will implement a novel approach for reaching the cavity-QED strong-coupling regime with a single semiconductor quantum dot (QD) and a mode of an optical micro-cavity. Such coupling, not yet achieved in any laboratory, implies that a single photon can strongly drive the QD, and that emission from an excited-state QD will occur deterministically and predominantly into a single mode of the light field. This extreme degree of control at the single-quantum level will potentially enable the PI to develop several useful applications in Quantum Information Processing:1. Deterministic production of single photons on demand (useful for ensuring the security of quantum cryptography);2. Writing and reading of quantum information into and out of material systems;3. Deterministic production of pairs of polarization-entangled photons on demand (useful as a resource for quantum communication or for linear-optics computing);4. Quantum information processing or computing.The immediate goal will be to demonstrate that the external-cavity system already constructed in our laboratory will provide a sufficient level of coherent coupling between a QD and an optical cavity mode to meet requirements for QD-based Quantum Information Processing (QIP). The second goal during the 3-year funded period will be items 1 and 2 above. The research will contribute to a potential revolution in communications technology if quantum techniques truly become operable. The research here will contribute to the development of efficient solid-state sources of single photons and photon pairs, as well as the coherent control of single quantum dots that is needed for manipulating electronic and spin states in these systems for quantum computing. Quantum Information Science is popular with students - both graduate and undergraduate. It is attracting students into research. Undergraduates, including male and female, have worked on the project. The project has also attracted visiting scientists and students from abroad, providing a culturally broadening experience for the students. The material is finding its way into undergraduate and graduate-level courses. The PI recently initiated and taught a new course at the level of undergraduate non-science majors, called The Physics Behind the Internet, for which he has recently authored a textbook.