论文标题
概率幅度幅度形状，用于连续可变的量子键分布，并在窃听通道上进行离散调制
Probabilistic amplitude shaping for continuous-variable quantum key distribution with discrete modulation over a wiretap channel
论文作者
论文摘要
为了实现最大信息传输并面对可能的窃听器，将从连续的高斯分布中得出连续变量量子键分布（CV-QKD）方案中传输的样品。实际上，在实际实现中，发射器具有有限的（功率）动力学，而高斯采样只能近似。这要求量子协议以小幂运行。在本文中，我们表明，一组有限符号的合适概率振幅构成允许随着最佳通道容量的近似值，也可以增加平均功率。我们研究了这种方法在CV-QKD框架中的可行性，提出了一种采用离散正交幅度调制的协议，该协议有助于概率振幅塑造，并且我们执行了窃听通道和无损耗同伴检测的关键生成率分析。
To achieve the maximum information transfer and face a possible eavesdropper, the samples transmitted in continuous-variable quantum key distribution (CV-QKD) protocols are to be drawn from a continuous Gaussian distribution. As a matter of fact, in practical implementations the transmitter has a finite (power) dynamics and the Gaussian sampling can be only approximated. This requires the quantum protocols to operate at small powers. In this paper, we show that a suitable probabilistic amplitude shaping of a finite set of symbols allows to approximate at will the optimal channel capacity also for increasing average powers. We investigate the feasibility of this approach in the framework of CV-QKD, propose a protocol employing discrete quadrature amplitude modulation assisted with probabilistic amplitude shaping, and we perform the key generation rate analysis assuming a wiretap channel and lossless homodyne detection.
