Quantum teleportation and entanglement swapping with long baseline in outer space

TL;DR

This paper discusses the potential advantages and fundamental implications of performing quantum teleportation and entanglement swapping experiments in outer space with long baselines, highlighting their significance for quantum physics and relativity.

Contribution

It provides an analysis of how space-based quantum experiments can overcome current limitations and explore fundamental questions in gravitational quantum physics and relativistic quantum information.

Findings

Long baseline space experiments reduce light transmission loss.

They can involve observers at spacelike and timelike separations.

These experiments can clarify causal independence in Bell tests.

Abstract

Quantum information experiments applying quantum optics in outer space with a very long baseline may have advantages over the current earth-bound experiments or the earth-to-satellite experiments because they can minimize the loss in light transmission and maximize the gain in time resolution. This future class of experiments, amongst them quantum teleportation and entanglement swapping, can shed light on many fundamental theoretical issues in gravitational quantum physics and relativistic quantum information. Regarding relativity theory, these experiments in an outer-space setting can involve observers at spacelike and timelike separations and explicate intriguing phenomena from different choices of time-slicing. Regarding quantum information, they may be able to ensure the causal independence of the expectation values in the Bell test. These issues are addressed in this paper with analysis and explanations.