# Schwinger effect of a relativistic boson entangled with a qubit

## TL;DR

This paper investigates how the Schwinger effect impacts entanglement between a qubit and a bosonic mode, revealing that particle production decreases their quantum correlation and entanglement, with notable differences from fermionic cases.

## Contribution

It introduces a novel analysis of the Schwinger effect on bosonic entangled states, highlighting differences from fermionic systems and clarifying how entanglement and correlation are affected.

## Key findings

- Electric field reduces entanglement between qubit and particle mode.
- Schwinger effect does not generate entanglement between qubit and antiparticle mode.
- Correlation can be induced between qubit and antiparticle mode.

## Abstract

We use the concept of quantum entanglement to analyze the Schwinger effect on an entangled state of a qubit and a bosonic mode coupled with the electric field. As a consequence of the Schwinger production of particle-antiparticle pairs, the electric field decreases both the correlation and the entanglement between the qubit and the particle mode. This work exposes a profound difference between bosons and fermions. In the bosonic case, entanglement between the qubit and the antiparticle mode cannot be caused by the Schwinger effect on the preexisting entanglement between the qubit and the particle mode, but correlation can.