Superior decoy state and purification quantum key distribution protocols for realistic quantum-dot based single photon sources

Yoad Ordan, Yuval Bloom, Tamar Levin, Kfir Sulimany, Jennifer A. Hollingsworth, Ronen Rapaport
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Abstract

The original proposal of quantum key distribution (QKD) was based on ideal single photon sources, which 40 years later, are still challenging to develop. Therefore, the development of decoy state protocols using weak coherent states (WCS) from lasers, set the frontier in terms of secure key rates. Here, we propose and experimentally emulate two simple-to-implement protocols that allow practical, far from ideal sub-Poissonian photon sources to outperform state-of-the-art WCS. By engineering the photon statistics of a quantum dot's biexciton-exciton cascade, we show that either a truncated decoy state protocol or a heralded purification protocol can be employed to achieve a significantly increased performance in terms of the maximal allowed channel loss for secure key creation, which can exceed that of WCS by more than 3dB. We then show that our recently demonstrated room temperature single photon sources, based on giant colloidal quantum dots coupled to nano-antennas, are already well within the optimal performance range. These protocols can be utilized efficiently on a host of various sub-Poissonian quantum emitters having controllable photon statistics, offering a practical approach to QKD without the hindering requirements on the single photon purity of the photon source.
基于现实量子点的单光子源的卓越诱饵态和净化量子密钥分发协议
量子密钥分发(QKD)的最初提议是基于理想光子源,40 年后的今天,开发这种光子源仍然充满挑战。因此,利用激光器的弱相干态(WCS)开发诱饵态协议,为安全密钥率开辟了前沿领域。在这里,我们提出并通过实验仿真了两个简单易行的协议,它们允许实用的、远非理想的亚泊松光子源超越最先进的 WCS。通过对量子点的猝发子-猝灭子级联的光子统计进行工程设计,我们展示了截断诱饵态协议或预示净化协议的应用,可以在安全密钥创建的最大允许信道损耗方面显著提高性能,其性能可以超过 WCS 3dB 以上。然后,我们展示了我们最近展示的室温单光子源,该单光子源基于与纳米天线耦合的巨型胶体量子点,已经很好地达到了最佳性能范围。这些协议可以在各种具有可控光子统计特性的亚泊松子量子发射器上有效利用,为 QKD 提供了一种实用的方法,而不会对光子源的单光子纯度造成阻碍。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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