Enhanced quantum teleportation in the background of Schwarzschild spacetime by weak measurements
College of Physics and Electronic Information, Gannan Normal University, Ganzhou, 341000, Jiangxi, China
2 Microsystems and Terahertz Research Center, China Academy of Engineering Physics, Chengdu, 610200, Sichuan, China
3 School of Information Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, Jiangxi, People’s Republic of China
Accepted: 6 September 2019
Published online: 17 January 2020
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.
© Società Italiana di Fisica (SIF) and Springer-Verlag GmbH Germany, part of Springer Nature, 2020