Hybrid quantum repeater using bright coherent light.
Hybrid quantum repeater using bright coherent light.
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DOI：
10.1103/physrevlett.96.240501
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发表时间：
2005-10
影响因子：
8.6
通讯作者：
P. Loock;T. Ladd;T. Ladd;K. Sanaka;K. Sanaka;F. Yamaguchi;K. Nemoto;W. Munro;W. Munro;Y. Yama
中科院分区：
文献类型：
--
作者：
P. Loock;T. Ladd;T. Ladd;K. Sanaka;K. Sanaka;F. Yamaguchi;K. Nemoto;W. Munro;W. Munro;Y. Yama
我们描述了一个用于长距离量子通信的量子中继协议。在该方案中，通过使用弱色散光-物质相互作用并在站之间分配出射的明亮相干光脉冲，在通道的中间站处的量子比特之间产生纠缠。然后通过零差检测和后选择以高成功概率制备了电子自旋的噪声纠缠对。用于纠缠纯化和交换的本地门是确定性的且无需测量，基于与初始纠缠分布相同的相干光资源和弱相互作用。最后，纠缠被存储在基于核自旋的量子存储器中。在我们的系统中，量子比特通信速率接近100 Hz，超过1280 km，具有接近99%的准确度，对于合理的本地门误差是可能的。
We describe a quantum repeater protocol for long-distance quantum communication. In this scheme, entanglement is created between qubits at intermediate stations of the channel by using a weak dispersive light-matter interaction and distributing the outgoing bright coherent-light pulses among the stations. Noisy entangled pairs of electronic spin are then prepared with high success probability via homodyne detection and postselection. The local gates for entanglement purification and swapping are deterministic and measurement-free, based upon the same coherent-light resources and weak interactions as for the initial entanglement distribution. Finally, the entanglement is stored in a nuclear-spin-based quantum memory. With our system, qubit-communication rates approaching 100 Hz over 1280 km with fidelities near 99% are possible for reasonable local gate errors.