论文标题
带有单光子源的非破坏性量子纠缠闸门
Heralded non-destructive quantum entangling gate with single-photon sources
论文作者
论文摘要
预言纠缠量子门是实施大规模光学量子计算的重要因素。然而，在线性光学系统中，真正的预言纠缠闸门的实验演示受到了概率的源源和参数下转换中的双对发射的阻碍。在这里，通过使用基于嵌入微圆柱腔中的半导体量子点的按需单光子源，我们首次演示了两个单个光子之间的预言受控（CNOT）操作。为了表征CNOT门的性能，我们估计其平均量子门保真度为（$ 87.8 \ pm1.2 $）％。作为一个应用程序，我们生成了备件准备就绪的铃铛状态，其保真度为（$ 83.4 \ pm2.4 $）％。我们的结果是迈向光子量子量子逻辑门发展的重要一步。
Heralded entangling quantum gates are an essential element for the implementation of large-scale optical quantum computation. Yet, the experimental demonstration of genuine heralded entangling gates with free-flying output photons in linear optical system, was hindered by the intrinsically probabilistic source and double-pair emission in parametric down-conversion. Here, by using an on-demand single-photon source based on a semiconductor quantum dot embedded in a micro-pillar cavity, we demonstrate a heralded controlled-NOT (CNOT) operation between two single photons for the first time. To characterize the performance of the CNOT gate, we estimate its average quantum gate fidelity of ($87.8\pm1.2$)%. As an application, we generated event-ready Bell states with a fidelity of ($83.4\pm2.4$)%. Our results are an important step towards the development of photon-photon quantum logic gates.
