Can the signatures of quantum superposition be detected through correlation harvesting?

A bstract In this paper, we explore correlation harvesting in quantum superposition, specifically focusing on the entanglement and mutual information extracted by two Unruh-DeWitt detectors interacting with a quantum field in a mass-superposed BTZ black hole spacetime. Our findings reveal that the superposed nature of spacetime induces constructive interference between the field modes that can significantly enhance the entanglement harvesting relative to a single spacetime background. In contrast to entanglement, the mutual information obtained in spacetime superposition is influenced by the proper distance between the two detectors. While the mutual information harvested in a superposed spacetime remains…

• NN
  National Natural Science Foundation of China

  Awards: 12374408, 12475051, No. 12374408, 2024JJ1006, 12035005
• NS
  Natural Science Foundation of Hunan Province

  Award: 2023JJ30384
• SA
  Science and Technology Program of Hunan Province

  Award: 2024RC1050