Quantum correlations with vacuum ambiguity in de Sitter space

TL;DR

This paper investigates how quantum correlations like entanglement and discord are affected by vacuum ambiguity in de Sitter space, revealing potential for encoding multiple vacua and simulating these effects experimentally.

Contribution

It demonstrates the degradation of quantum correlations due to cosmological horizon radiation and proposes using quantum information to distinguish different de Sitter vacua.

Findings

Quantum entanglement and discord degrade due to horizon radiation.

Quantum correlations can encode multiple de Sitter vacua.

Potential for simulating vacuum ambiguity effects in ion traps.

Abstract

We study the quantum correlations of free scalar field with vacuum ambiguity of de Sitter space. We show the occurrence of degradation of quantum entanglement and quantum discord between field modes for inertial observer in curved space due to the radiation associated with cosmological horizon. In particular, we find that quantum correlations can be used to encode infinite de Sitter invariant vacua, which correspond to infinite set of possible physical worlds. This may provide a superselection rule of physical vacuum via quantum information tasks. We also discuss the simulation of such quantum effects of vacuum ambiguity in ion trap experiments.