Generation of quantum entanglement in superposed diamond spacetime

TL;DR

This paper investigates how quantum entanglement is affected by superposed spacetime structures, revealing that superposition can generate additional entanglement resources, with implications for quantum information processing.

Contribution

It introduces a novel framework combining spacetime superposition with causal diamonds and derives analytical expressions for the Unruh-diamond vacuum state.

Findings

Quantum entanglement degrades in classical spacetime

Superposed spacetime structures generate additional entanglement resources

Spacetime superposition can serve as a resource for quantum information tasks

Abstract

A comprehensive study integrating the microscopic structure of spacetime and the principle of quantum superposition is capable of offering a fundamental bottom-up approach for understanding the quantum aspect of gravity. In this paper, we present a framework for the superposition causal diamond spacetime and analyze the behavior of quantum entanglement influenced by the spacetime superposition from the perspective of relativistic quantum information. For the first time, we combine the concept of spacetime superposition with causal diamonds and derive the analytical expression of the Unruh-diamond vacuum state for Dirac fields in the superposed causal diamond spacetime. Based on this, we analyze both initially correlated and uncorrelated modes in superposed and classical causal diamond spacetimes, and quantify how quantum thermal effects arising from spacetime structure alter entanglement. Our findings reveal that quantum entanglement degrades in classical diamond spacetime, while the superposing structure of spacetime generates additional entanglement resources between modes in superposed diamond spacetimes. From a quantum information perspective, our results suggest that the characteristics of spacetime superposition can serve as valuable resources for performing quantum information processing tasks.