Interfacing Neutral Atoms and Photons

连接中性原子和光子

• 批准号: 21748507
• 负责人: Professor Dr. Gerhard Rempe
• 金额: --
• 依托单位: Max-Planck-Institut für Quantenoptik (MPQ)
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/21748507?language=en
• 关键词: Interfacing; Neutral; Atoms; Photons

For the realisation of a scalable quantum processor, elementary quantum network links interconnecting individual quantum systems are essential. Our goal is to establish such links between distant atoms, and to demonstrate the entanglement and teleportation of atomic states between them. In project E3, we will study correlations between the atomic spin and the polarisation of a single photon emitted from this atom into a high-finesse optical cavity. The photon and the atom are expected to show entanglement, since the two possible polarisations of the photon are connected to two different spin states of the atom. Based on this, we will entangle two distant atoms located in separate cavities, using correlation measurements on pairs of photons being emitted from the atoms. These measurements will project the atom pair into spin-entangled states. A natural extension of the entanglement is the teleportation of a quantum state from one atom to another. This can be done using a Bell-state measurement on the photons combined with a conditional spin-flip acting on the target atom.In parallel, we are aiming at an extension of the atom-cavity arrangements used in project E3 to a scalable many-atom many-cavity network. To that purpose, we will use of a planar matrix of tiny optical dipole-force traps, formed by the image of a large array of digitally controlled micro mirrors (DMD s), This arrangement represents a freely configurable array of optical tweezers. It will allow one to move atoms around independently from one another, so that selected pairs of atoms can be brought to interact, e.g. in a surrounding high-finesse cavity.

为了实现可扩展的量子处理器，将各个量子系统互连的基本量子网络链路是必不可少的。我们的目标是在遥远的原子之间建立这种联系，并证明它们之间原子态的纠缠和隐形传态。在项目E3中，我们将研究原子自旋与从该原子发射到高精细光学腔中的单个光子的偏振之间的相关性。由于光子的两种可能的偏振态与原子的两种不同自旋态相关联，因此光子和原子被认为是纠缠的。在此基础上，我们将纠缠两个遥远的原子位于不同的腔，使用相关测量的光子对从原子发射。这些测量将把原子对投射到自旋纠缠态。纠缠的一个自然延伸是量子态从一个原子到另一个原子的隐形传态。这可以通过对光子的Bell态测量结合对靶原子的条件自旋翻转来实现。同时，我们的目标是将E3项目中使用的原子-腔安排扩展为可扩展的多原子多腔网络。为此，我们将使用一个平面矩阵的微小的光学偶极力陷阱，形成的图像的一个大阵列的数字控制的微镜（DMD），这种安排代表了一个自由配置的光镊阵列。它将允许一个原子相互独立地移动，这样选定的原子对就可以相互作用，例如在周围的高精细腔中。