arXiv 1506.049922015-06-16quant-ph

作为量子网络节点的可控单光子分束器

A controllable single photon beam-splitter as a node of a quantum network

Gaurav Gautam, Santosh Kumar, Saikat Ghosh, Deepak Kumar

备注：: 24 pages, 7 figures

摘要：

本文提出并分析了可控单光子分束器的模型。它由两个交叉的光腔组成，光腔的腰部相互重叠，光腔与单个飞行原子动态耦合。该系统示出路由一个单光子与近单位效率在一个有效的“弱耦合”制度。此外，两个这样的节点，形成一个量子网络的一部分，显示执行几个受控的量子操作。所有单量子位操作都涉及光子从一个节点中的一个腔到另一个腔的传输，而双量子位操作则涉及通过光纤耦合从一个节点到下一个节点的传输。经典光场的新的定时协议被发现简化可能的实验实现，以及可实现的有效参数制度。虽然我们的分析仅限于腔QED场景，但模型的基本特征可以扩展到各种其他物理系统，包括门控量子点，电路QED或光机械元件。

英文摘要：

A model for a controlled single-photon beam-splitter is proposed and analysed. It consists of two crossed optical-cavities with overlapping waists, dynamically coupled to a single flying atom. The system is shown to route a single photon with near-unity efficiency in an effective "weak-coupling" regime. Furthermore, two such nodes, forming a segment of a quantum network, are shown to perform several controlled quantum operations. All one-qubit operations involve a transfer of a photon from one cavity to another in a single node, while two-qubit operations involve transfer from one node to a next one, coupled via an optical fiber. Novel timing protocols for classical optical fields are found to simplify possible experimental realizations along with achievable effective parameter regime. Though our analysis here is restricted to a cavity-QED scenario, basic features of the model can be extended to various other physical systems including gated quantum dots, circuit-QED or opto-mechanical elements.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

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