论文标题

量子因果关系结构的量子传送

Quantum teleportation of quantum causal structures

论文作者

Krumm, Marius, Guérin, Philippe Allard, Zauner, Thomas, Brukner, Časlav

论文摘要

量子传送是一种非常有用的信息理论协议,它允许将未知的任意量子状态从一个位置传输到另一个位置,而无需通过中间区域传输量子系统。量子状态,量子通道和不确定的因果结构都是量子因果结构的示例,不仅可以实现高级量子信息处理功能,而且还可以在非经典空间中建模因果结构。在这封信中,我们开发了由过程矩阵框架正式形式化的任意量子因果结构的量子传送。核心思想不是传送实现因果结构的所有物理自由度,而是将输入传送到代理商运营的输出和输出。对于确定性量子传送所必需的贝尔状态测量结果的交流是人们可能希望调查的所有因果结构所必需的。为了避免此问题,我们提出了部分和完全后选择的传送协议。我们证明,部分后选择的传送方案与所有量子因果结构兼容,包括涉及不确定因果秩序的结构。

Quantum teleportation is a very helpful information-theoretic protocol that allows to transfer an unknown arbitrary quantum state from one location to another without having to transmit the quantum system through the intermediate region. Quantum states, quantum channels, and indefinite causal structures are all examples of quantum causal structures that not only enable advanced quantum information processing functions, but can also model causal structures in nonclassical spacetimes. In this letter, we develop quantum teleportation of arbitrary quantum causal structures, as formalized by the process matrix framework. Instead of teleporting all the physical degrees of freedom that implement the causal structure, the central idea is to just teleport the inputs to and outputs from the operations of agents. The communication of outcomes of Bell state measurements, which is necessary for deterministic quantum teleportation, is not possible for all causal structures that one might wish to investigate. To avoid this problem, we propose partially and fully post-selected teleportation protocols. We prove that our partially post-selected teleportation protocol is compatible with all quantum causal structures, including those that involve indefinite causal order.

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