论文标题
量子空间叠加和超亮信号传导的可能性
Quantum spatial superpositions and the possibility of superluminal signaling
论文作者
论文摘要
最近提出的gedankenexperiment涉及两个对象之间的（引力或电磁）相互作用（一个放置在两个位置的量子叠加状态）中，似乎允许更快地通信。但是，有人认为，如果介导场赋予量子特性，则完全避免了静光信号传导的可能性。此外，在重力情况下，该结论已被用来主张必须对重力场进行量化的观点。在这项工作中，我们澄清和补充了讨论的某些方面。特别是，通过关注纠缠在系统的组件中传播的方式，我们为无法进行超光信号传导的基本量子特征提供了一些见解，并且我们提供了在此和相关协议中提供这种不可能的更一般性证明。
A recently proposed gedankenexperiment involving the (gravitational or electromagnetic) interaction between two objects--one placed in a state of quantum superposition of two locations--seems to allow for faster-than-light communication. However, it has been argued that, if the mediating fields are endowed with quantum properties, then the possibility for superluminal signaling is fully avoided. Moreover, in the gravitational case, this conclusion has been used to argue for the view that the gravitational field must be quantized. In this work, we clarify and complement some aspects of the discussion. In particular, by focusing on the way in which entanglement spreads across the components of the system, we offer some insights into the fundamental quantum features behind the impossibility of superluminal signaling and we provide a more general proof of such an impossibility in this and related protocols.
