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有读书笔记An entangled-light-emitting diode

beimu1009 添加于 2010-6-8 21:15 | 1326 次阅读 | 0 个评论

  •  作 者

    Salter CL, Stevenson RM, Farrer I, Nicoll CA, Ritchie DA, Shields AJ

  •  摘 要

    An optical quantum computer, powerful enough to solve problems so far intractable using conventional digital logic, requires a large number of entangled photons1, 2. At present, entangled-light sources are optically driven with lasers3, 4, 5, 6, 7, which are impractical for quantum computing owing to the bulk and complexity of the optics required for large-scale applications. Parametric down-conversion is the most widely used source of entangled light, and has been used to implement non-destructive quantum logic gates8, 9. However, these sources are Poissonian4, 5 and probabilistically emit zero or multiple entangled photon pairs in most cycles, fundamentally limiting the success probability of quantum computational operations. These complications can be overcome by using an electrically driven on-demand source of entangled photon pairs10, but so far such a source has not been produced. Here we report the realization of an electrically driven source of entangled photon pairs, consisting of a quantum dot embedded in a semiconductor light-emitting diode (LED) structure. We show that the device emits entangled photon pairs under d.c. and a.c. injection, the latter achieving an entanglement fidelity of up to 0.82. Entangled light with such high fidelity is sufficient for application in quantum relays11, in core components of quantum computing such as teleportation12, 13, 14, and in entanglement swapping15, 16. The a.c. operation of the entangled-light-emitting diode (ELED) indicates its potential function as an on-demand source without the need for a complicated laser driving system; consequently, the ELED is at present the best source on which to base future scalable quantum information applications17.

  •  详细资料

    • 文献种类:期刊
    • 期刊名称: Nature
    • 期刊缩写: Nature
    • 期卷页: 2010年  第465卷 第7298期 594-597页
    • ISBN: 0028-0836

  • 相关链接 DOI URL 

  •  beimu1009 的文献笔记  订阅

    关键词：量子计算机

    自然》网站报 道，英国物理学家和日本东芝公司的科学家合作研制出纠缠态发光二极管，朝着实用性的量子计算机迈进一大步。

    创造量子计算的一大障碍是纠缠粒子的可靠性。现在，东芝公司和剑桥大学提供了解决问题的一个关 键工具，这个工具很容易制造，在有需要时可以与电池连接发出纠缠光。量子计算机的运作过程需要大量纠缠态光子，目前只能用激光设备制造纠缠态光， 而东芝的新ELED则使用标准的半导体技术，和普遍用于光学电子设备的砷化镓为材料。东芝公司的Andrew Shields说：“这是一个巨大的进步，因为这意味着你可以把很多设备整合到一个单独的芯片中。”目前东芝尚未进入计算工作阶段，但Shields认 为，使用该技术的基本量子计算电路可以在五年内完成。

     

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