标题： 量子场域信道容量的超可加性 显示英文标题

标题： Superadditivity of channel capacity through quantum fields

摘要： 鉴于任何通信都可以视为通过量子场的通信，我们研究了发送方爱丽丝（Alice）在量子场中引起携带信息的扰动的情景。 我们利用量子信息胶囊（QIC）技术追踪这些扰动在空间和时间上的精确传播。 我们发现，爱丽丝与接收方鲍勃（Bob）之间的信道容量可以通过鲍勃不仅在爱丽丝编码操作的因果未来内部放置探测器，还可以在外部放置探测器而得到增强。 直观上，这种类型的超可加性出现是因为爱丽丝因果未来的场与其因果未来外部的场存在纠缠。 因此，鲍勃在爱丽丝因果未来外部的探测器接收到的量子噪声与他位于爱丽丝因果未来内部的探测器的噪声是相关的。 实际上，这种相关性允许鲍勃改善那些位于爱丽丝因果未来的探测器的信噪比。 此外，我们发展了QIC技术的多模态推广。 这使我们能够将分析扩展到爱丽丝操作多个局部化且可选纠缠发射器的情况。 我们将新技术应用于爱丽丝通过操作多个适当地排列和预先定时的发射器以生成量子冲击波来增强信道容量的场景。 显示英文摘要

摘要： Given that any communication is communication through quantum fields, we here study the scenario where a sender, Alice, causes information-carrying disturbances in a quantum field. We track the exact spread of these disturbances in space and time by using the technique of quantum information capsules (QIC). We find that the channel capacity between Alice and a receiver, Bob, is enhanced by Bob placing detectors not only inside but in addition also outside the causal future of Alice's encoding operation. Intuitively, this type of superadditivity arises because the field outside the causal future of Alice is entangled with the field inside Alice's causal future. Hence, the quantum noise picked up by Bob's detectors outside Alice's causal future is correlated with the noise of Bob's detectors inside Alice's causal future. In effect, this correlation allows Bob to improve the signal-to-noise ratio of those of his detectors which are in the causal future of Alice. Further, we develop the multimode generalization of the QIC technique. This allows us to extend the analysis to the case where Alice operates multiple localized and optionally entangled emitters. We apply the new techniques to the case where Alice enhances the channel capacity by operating multiple emitters that are suitably lined up and pre-timed to generate a quantum shockwave in the field.