Device and semi-device-independent private quantum randomness generators are crucial for applications requiring private randomness. However, they are vulnerable to detection inefficiency attacks and this limits severely their usage for practical purposes. Here, we present a method for protecting semi-device-independent private quantum randomness generators in prepare-and-measure scenarios against detection inefficiency attacks. The key idea is the introduction of a blocking device that adds failures in the communication between the preparation and measurement devices. We prove that, for any detection efficiency, there is a blocking rate that provides protection against these attacks. We experimentally demonstrate the generation of private randomness using weak coherent states and standard avalanche photo-detectors.

器件和半器件无关的私有量子随机性发生器对于需要私有随机性的应用至关重要。但是，它们很容易受到检测效率低下的攻击，这严重限制了它们在实际用途中的使用。在这里，我们提出了一种在准备和测量情况下保护半独立于设备的私有量子随机性发生器免受检测效率低下的攻击的方法。关键思想是引入阻塞设备，该阻塞设备增加了制备和测量设备之间的通信故障。我们证明，对于任何检测效率，都有一个阻止速率，可以抵御这些攻击。我们实验证明了使用弱相干态和标准雪崩光电探测器产生私人随机性的过程。