论文标题
嘈杂的预处理促进了独立于设备的量子键分布的光子实现
Noisy pre-processing facilitating a photonic realisation of device-independent quantum key distribution
论文作者
论文摘要
即使用量子通道通信的设备在很大程度上没有表征，与设备无关的量子密钥分布也提供了安全性。然而，对独立于设备的量子键分布的实验证明是具有挑战性的。光子实现的核心障碍是，全球检测效率，即成功接收到量子通道上发送的信号的概率，必须高于一定阈值。我们在这里提出了一种方法来显着放松该阈值，同时保持可证明的与设备无关的安全性。这是通过在初始测量数据（原始密钥）中添加人造噪声的协议来实现的，该协议添加了人工噪声，该噪声无法被对手知道或控制。为了使用基于自发参数降低转换源的源进行逼真的光子设置，我们就最小所需的全局检测效率给出了明确的界限。
Device-independent quantum key distribution provides security even when the equipment used to communicate over the quantum channel is largely uncharacterized. An experimental demonstration of device-independent quantum key distribution is however challenging. A central obstacle in photonic implementations is that the global detection efficiency, i.e., the probability that the signals sent over the quantum channel are successfully received, must be above a certain threshold. We here propose a method to significantly relax this threshold, while maintaining provable device-independent security. This is achieved with a protocol that adds artificial noise, which cannot be known or controlled by an adversary, to the initial measurement data (the raw key). Focusing on a realistic photonic setup using a source based on spontaneous parametric down conversion, we give explicit bounds on the minimal required global detection efficiency.
