Entanglement of two qubits in a relativistic orbit

TL;DR

This paper studies how relativistic acceleration affects entanglement between two qubits, showing that acceleration suppresses vacuum entanglement and leads to entanglement decay, with implications for quantum information in relativistic settings.

Contribution

It provides a detailed analysis of entanglement dynamics for accelerating qubits, introducing a perturbative approach and a general concurrence function for symmetric relativistic trajectories.

Findings

Acceleration suppresses vacuum entanglement.

Entanglement sudden death occurs at a calculable time.

Acceleration radiation dominates at high accelerations.

Abstract

The creation and destruction of entanglement between a pair of interacting two-level detectors accelerating about diametrically opposite points of a circular path is investigated. It is found that any non-zero acceleration has the effect of suppressing the vacuum entanglement and enhancing the acceleration radiation thereby reducing the entangling capacity of the detectors. Given that for large accelerations the acceleration radiation is the dominant effect, we investigate the evolution of a two detector system initially prepared in a Bell state using a perturbative mater equation and treating the vacuum fluctuations as an unobserved environment. A general function for the concurrence is obtained for stationary and symmetric worldlines in flatspace. The entanglement sudden death time is computed.