# Enhanced quantum teleportation in the background of Schwarzschild spacetime by weak measurements

## TL;DR

This paper demonstrates that pre- and post-weak measurements can nearly fully protect quantum teleportation fidelity from Hawking radiation effects in Schwarzschild spacetime, highlighting a novel use of weak measurements against gravitational decoherence.

## Contribution

It introduces a method using weak measurements to counteract gravitational decoherence in quantum teleportation near black holes, extending their application in relativistic quantum information.

## Key findings

- Hawking effect can be eliminated by weak measurements.
- Teleportation fidelity is preserved despite gravitational effects.
- Weak measurements improve quantum communication robustness in curved spacetime.

## Abstract

It is commonly believed that the fidelity of quantum teleportation in the gravitational field would be degraded due to the heat 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.