Localizing quantum fields with time-dependent potentials

TL;DR

This paper investigates how dynamically growing cavity walls via time-dependent potentials can localize quantum field modes without significant mixedness, addressing entanglement concerns in relativistic quantum information protocols.

Contribution

It demonstrates a method to localize quantum fields dynamically without increasing mixedness, countering prior concerns about entanglement hindering relativistic quantum information tasks.

Findings

Localization achieved without significant mixedness

Addresses entanglement concerns in localized quantum fields

Potential for improved relativistic quantum information protocols

Abstract

In this paper we study the effect of localizing quantum field degrees of freedom by dynamically growing cavity walls through a time-dependent potential. We use our results to show that it is possible to do this without introducing non-negligible mixedness in localized modes of the field. We discuss how this addresses the concerns, raised in previous literature, that the high degree of entanglement of regular states in QFT may hinder relativistic quantum information protocols that make use of localized relativistic probes.