论文标题
量子传送与不完美的量子点
Quantum Teleportation with Imperfect Quantum Dots
论文作者
论文摘要
有效的全光量子量子传送需要高度无法区分和纠缠的光子的快速和确定性来源。基于固态的量子发射器（尤其是半导体量子点）是该角色的有前途的候选人。然而，尽管纳米制作取得了显着的进展，但量子传送的概念概念证明表明，发射极的不完美仍然在应用程序的方式上留下了重大障碍。在这里，我们没有专注于来源优化策略，而是处理瑕疵并研究不同的传送方案，目的是确定具有最大传送忠诚度的传送协议。使用具有纠缠和光子不可区分性的量子点，我们表明平均传送保真度可以从经典限制以下提高到0.842（14）。我们的结果得到了一个理论模型的支持，该模型定量解释了实验发现，它松开了在理想的纠缠量源上设置的非常严格的要求，并强调了不完美的量子点仍然可以在基于传送的量子通信架构中发表意见。
Efficient all-photonic quantum teleportation requires fast and deterministic sources of highly indistinguishable and entangled photons. Solid-state-based quantum emitters--notably semiconductor quantum dots--are a promising candidate for the role. However, despite the remarkable progress in nanofabrication, proof-of-concept demonstrations of quantum teleportation have highlighted that imperfections of the emitter still place a major roadblock in the way of applications. Here, rather than focusing on source optimization strategies, we deal with imperfections and study different teleportation protocols with the goal of identifying the one with maximal teleportation fidelity. Using a quantum dot with sub-par values of entanglement and photon indistinguishability, we show that the average teleportation fidelity can be raised from below the classical limit to 0.842(14). Our results, which are backed by a theoretical model that quantitatively explains the experimental findings, loosen the very stringent requirements set on the ideal entangled-photon source and highlight that imperfect quantum dots can still have a say in teleportation-based quantum communication architectures.
