论文标题
量子点是量子网络强烈纠缠光子的潜在来源
Quantum dots as potential sources of strongly entangled photons for quantum networks
论文作者
论文摘要
高度纠缠的光子对的产生和长途传播是新兴光子量子技术的基石，具有诸如量子密钥分布和分布式量子计算之类的关键应用。但是，最大传输距离的自然限制不可避免地通过介质中的衰减来设定。包含多个纠缠光子来源的量子中继器网络将允许克服此限制。为此，对源的亮度以及光子对的纠缠程度和不可区分性的要求非常严格。尽管到目前为止取得了令人印象深刻的进展，但仍在寻求确定的可扩展光子源来满足此类要求。半导体量子点在这种情况下以极化纠缠的光子对来源而出色。在这项工作中，我们介绍了基于GAAS的量子点设置的最先进的，并将其用作基准，讨论要克服实现实际量子网络的挑战。
The generation and long-haul transmission of highly entangled photon pairs is a cornerstone of emerging photonic quantum technologies, with key applications such as quantum key distribution and distributed quantum computing. However, a natural limit for the maximum transmission distance is inevitably set by attenuation in the medium. A network of quantum repeaters containing multiple sources of entangled photons would allow to overcome this limit. For this purpose, the requirements on the source's brightness and the photon pairs' degree of entanglement and indistinguishability are stringent. Despite the impressive progress made so far, a definitive scalable photon source fulfilling such requirements is still being sought for. Semiconductor quantum dots excel in this context as sub-poissonian sources of polarization entangled photon pairs. In this work we present the state-of-the-art set by GaAs based quantum dots and use them as a benchmark to discuss the challenges to overcome towards the realization of practical quantum networks.
