Since the theory of quantum mechanics brought about a revolution in physics nearly a century ago, various applications have emerged. In particular, the quantum properties of photons are being studied to provide a solution to some of the challenges faced by existing communication networks, such as security issues and energy efficiency. One of these properties is teleportation, via which information regarding the state of a photon, without its physical motion, can be transmitted across a classical channel. We report, perhaps for the first time, the teleportation of photons across a simulated air–water interface. An entangled pair of photons is generated from a mode-locked laser source, through spontaneous four-wave mixing (SFWM). One of the pair is sent wirelessly to an underwater receiver. Six States of Polarization are teleported sequentially, implementing active feed-forward operation, with the average fidelity of 96.7% surpassing the classical limit. This work is anticipated to lead to the establishment of a quantum communication link between two different media.

中文翻译：

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在空气-水界面上实现光子的量子隐形传态

近一个世纪前，量子力学理论引发物理学革命以来，各种应用层出不穷。特别是，正在研究光子的量子特性，以解决现有通信网络面临的一些挑战，例如安全问题和能源效率。这些特性之一是隐形传态，通过它可以通过经典通道传输有关光子状态的信息，而无需其物理运动。我们可能是第一次报告光子在模拟的空气 - 水界面上的隐形传态。通过自发四波混合 (SFWM) 从锁模激光源产生一对纠缠光子。一对中的一个被无线发送到水下接收器。六种极化状态依次传送，实现主动前馈操作，平均保真度96.7%，超过经典极限。预计这项工作将导致在两种不同媒体之间建立量子通信链接。