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首页> 外文会议>Conference on The Nature of Light: What Are Photons? >Multi-photon entanglement: From quantum curiosity to quantum computing and quantum repeaters
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Multi-photon entanglement: From quantum curiosity to quantum computing and quantum repeaters

机译：多光子纠缠：从量子化的好奇心与量子计算和量子中继器

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In the emerging field of quantum information technology the two basic subfields are quantum communication and quantum computation. Photonic qubits are considered as most promising information carriers for this new technology due to the immense advantage of suffering negligible decoherence. Additionally, the very small photon-photon interactions can be replaced by inducing effective nonlinearities via measurements which allow for the implementation of crucial two-qubit gate operations. Although the spontaneous parametric down-conversion gives access to the generation of highly entangled few-photon states, such as four-qubit cluster states which allow to demonstrate the new concept of the one-way quantum computer, its applicability is highly limited due to the poor scaling of the simultaneous emission of more than one-entangled photon pair. Therefore of particular interest is the reversible mapping of qubits from photon states to atomic states. This might allow the implementation of photonic quantum repeaters for long-distance quantum communication or the generation of arbitrary multi-photon states as required for linear-optics quantum computing. Thus for the realization of such a quantum network several approaches for achieving the required quantum control between matter and photons have been studied during the past few years. Recent experiments demonstrating the generation of narrow-bandwidth single photons using a room-temperature ensemble of ~(87)Rb atoms and electromagnetically induced transparency should emphasize the progress towards such a quantum network.
机译：在Quantum信息技术的新兴领域中，两个基本子场是量子通信和量子计算。由于遭受可忽略不计的障碍的巨大优势，光子额度被认为是这种新技术的最有前途的信息载体。另外，可以通过测量诱导有效非线性来替换非常小的光子 - 光子相互作用，其允许实现至关重要的双量标栅极操作。虽然自发的参数扫描阶段可以访问高度纠缠的少数光子状态的生成，例如四个QUBBit集群状态，其允许展示单向量子计算机的新概念，其适用性因同时发射不止一个缠绕的光子对的缩放不佳。因此，特别感兴趣的是从光子状态到原子状态的Qubits的可逆映射。这可能允许实现光子量子中继器，用于长距离量子通信或根据线性光学量子计算所需的任意多光子状态的产生。因此，为了实现这种量子网络，在过去几年中已经研究了几种用于在物质和光子之间实现所需量子控制的方法。最近实验证明使用〜（87）RB原子的室温整体产生窄带宽单光子，并且电磁诱导的透明度应该强调对这种量子网络的进展。

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