论文标题
置换增强了纠缠状态协助的经典沟通
Permutation Enhances Classical Communication Assisted by Entangled States
论文作者
论文摘要
当嘈杂的量子通道和接收器之间的编码和两部分状态中允许的本地操作和全局排列时，我们为经典通信提供了一个经典通信的能力公式。该公式的两个端点是孔波能力（无纠缠援助）和纠缠辅助能力（无限制的纠缠援助）。更重要的是，我们表明能力满足强大的匡威财产，因此该公式是可实现和无法实现的沟通速率之间的急剧分界线。我们证明，辅助能力和孔波容量之间的差异是由前卫星状态形成的不一致的上限。作为示例，我们从分析中得出各种量子渠道的经典能力。我们的结果见证了每当有纠缠援助时，随机排列在古典交流中的力量。
We give a capacity formula for the classical communication over a noisy quantum channel, when local operations and global permutations allowed in the encoding and bipartite states preshared between the sender and the receiver. The two endpoints of this formula are the Holevo capacity (without entanglement assistance) and the entanglement-assisted capacity (with unlimited entanglement assistance). What's more, we show that the capacity satisfies the strong converse property and thus the formula serves as a sharp dividing line between achievable and unachievable rates of communication. We prove that the difference between the assisted capacity and the Holevo capacity is upper bounded by the discord of formation of the preshared state. As examples, we derive analytically the classical capacity of various quantum channels of interests. Our result witnesses the power of random permutation in classical communication, whenever entanglement assistance is available.
