Quantum teleportation, the process by which Alice can transfer an unknown quantum state to Bob by using preshared entanglement and classical communication, is one of the cornerstones of quantum information. The standard benchmark for certifying quantum teleportation consists in surpassing the maximum average fidelity between the teleported and the target states that can be achieved classically. According to this figure of merit, not all entangled states are useful for teleportation. Here we propose a new benchmark that uses the full information available in a teleportation experiment and prove that all entangled states can implement a quantum channel which cannot be reproduced classically. We introduce the idea of nonclassical teleportation witness to certify if a teleportation experiment is genuinely quantum and discuss how to quantify this phenomenon. Our work provides new techniques for studying teleportation that can be immediately applied to certify the quality of quantum technologies.

中文翻译：

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所有纠缠的国家都可以证明非经典的隐形传送

量子隐形传态是爱丽丝利用预共享纠缠和经典通信将未知量子态转移到鲍勃的过程，是量子信息的基石之一。证明量子隐形传态的标准基准在于超越传统上可以实现的隐形态和目标态之间的最大平均保真度。根据这个优值，并非所有纠缠态都对隐形传讯有用。在这里，我们提出了一个新的基准，该基准使用了隐形传态实验中可用的全部信息，并证明了所有纠缠态都可以实现无法经典再现的量子通道。我们介绍了非经典的隐形传态见证者的思想，以证明隐形传态实验是否是真正的量子，并讨论如何量化这种现象。我们的工作提供了研究隐形传态的新技术，这些新技术可立即用于验证量子技术的质量。