Enhanced quantum teleportation in the background of Schwarzschild spacetime by weak measurements
Enhanced quantum teleportation in the background of Schwarzschild spacetime by weak measurements
复制标题
通过弱测量增强史瓦西时空背景下的量子隐形传态
DOI：
10.1140/epjp/s13360-019-00010-5
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Ying-Mao Xie
中科院分区：
文献类型：
--
作者：
Xing Xiao;Yao Yao;Yan-Ling Li;Ying-Mao Xie
人们普遍认为，由于霍金辐射的加热，引力场中量子隐形传态的保真度将会降低。在本文中，我们指出，霍金效应可以通过前后弱测量的联合作用来消除，从而几乎完全保护了隐形传态的保真度。有趣的是，保真度的提高不能归因于纠缠的改善，而是弱测量的概率性质。我们的工作扩展了弱测量作为一种量子技术对抗相对论量子信息中引力退相干的能力。
It is commonly believed that the fidelity of quantum teleportation in the gravitational field would be degraded due to the heating up by the Hawking radiation. In this paper, we point out that the Hawking effect could be eliminated by the combined action of pre-and post-weak measurements, and thus, the teleportation fidelity is almost completely protected. It is intriguing to notice that the enhancement of fidelity could not be attributed to the improvement of entanglement, but rather to the probabilistic nature of weak measurements. Our work extends the ability of weak measurements as a quantum technique to battle against gravitational decoherence in relativistic quantum information.