论文标题
热噪声损失的骨值多访问通道的基本限制
Fundamental Limits of Thermal-noise Lossy Bosonic Multiple Access Channel
论文作者
论文摘要
骨通道描述了量子力学上的许多实用通信链接，例如光学，微波和射频。我们研究了在环境添加的热噪声的存在以及发射机利用高斯状态输入时，研究了玻色子多重访问通道（MAC）的最大速率。我们为热噪声损耗的玻色粒MAC的容量区域开发了一个外部结合。我们还发现，在发射器上使用相干状态是在高和低均值输入光子数的限制下实现容量的。此外，我们验证了连贯的状态是否能够实现通道的总和率。在非反应状态下，当对发射器施加了全局平均光子 - 串联约束时，相干状态是最佳的高斯状态。然而，令人惊讶的是，当每个发射器被单独约束时，使用单模挤压状态可以将连贯状态编码提供的容量增加。
Bosonic channels describe quantum-mechanically many practical communication links such as optical, microwave, and radiofrequency. We investigate the maximum rates for the bosonic multiple access channel (MAC) in the presence of thermal noise added by the environment and when the transmitters utilize Gaussian state inputs. We develop an outer bound for the capacity region for the thermal-noise lossy bosonic MAC. We additionally find that the use of coherent states at the transmitters is capacity-achieving in the limits of high and low mean input photon numbers. Furthermore, we verify that coherent states are capacity-achieving for the sum rate of the channel. In the non-asymptotic regime, when a global mean photon-number constraint is imposed on the transmitters, coherent states are the optimal Gaussian state. Surprisingly however, the use of single-mode squeezed states can increase the capacity over that afforded by coherent state encoding when each transmitter is photon number constrained individually.
