Optically Driven Quantum Dot Spins for Quantum Computing: Coherence Between Spins in Entangled States

电子设备和信息处理领域的摩尔极限指的是这样一个时间点：单位面积上的设备数量如此之高，以至于每个设备的大小只有几个原子那么大，芯片将不再按照设计工作，芯片将失效。我们的实验旨在超越这个限制，在量子力学而不是经典行为决定性能的尺寸水平上工作。我们将开发设备之间的相干耦合，而不需要电线，以及实现量子相位，比如在携带信息的粒子之间，它将被用来携带额外的信息，并为发明和发现扩大视野。我们的研究包括理解纠缠系统中的退相干，这是一种独特的量子现象，并提供了相当普遍的见解，超出了我们的半导体量子点范式。在量子理论中，对微观系统（电子自旋）和宏观系统（点环境和控制或测量）之间相互作用的日益复杂的理解将为理解和发展未来的技术提供基础，因为当前的方法达到了它们的操作极限。量子物理前沿应用研究的跨学科性质在半导体纳米结构物理学、量子点的高精度相干光学控制和光谱学、多体理论和光物质相互作用等领域的合作者团队中得到了明显体现。在这个新领域，研究生和本科生的教育有助于培养对基础设施至关重要的训练有素的人才。

Moore's limit in electronic devices and information processing represents the point in time where the number of devices per unit area is so high that the size of each device is on the order of few atoms and will no longer function according to design and the chip will fail. Our experiments are designed to go beyond this limit, working at the size level where quantum mechanics rather the classical behavior determines performance. We will develop coherent coupling between devices, without the need for wires, as well as implement quantum phase, say between particles carrying information, that will be used to carry additional information and serve to expand the horizon for invention and discovery. Our studies include understanding decoherence in entangled systems, a unique quantum phenomena, and provide insight that is quite general and outside our paradigm of semiconductor quantum dots. The increasingly sophisticated understanding of the interaction between a microscopic system (the electron spins) and a macroscopic system (the dot environment and control or measurement) within quantum theory will provide a basis for understanding and development of future technology as current approaches reach their operational limits. The interdisciplinary nature of the research at the frontier of applications of quantum physics is evident by the team of collaborators in the physics of semiconductor nano-structures, in high-precision coherent optical control and spectroscopy of quantum dots, and in many-body theory and light-matter interaction. The education in this new frontier for both graduate and undergraduate students contributes to the development of highly trained people critical to the infrastructure.