![]() In contrast, for massive scalar fields both communication and genuine harvesting contribute equally to the bipartite entanglement when the detectors are causally connected. In other words, in these scenarios the entanglement harvesting protocol is truly “harvesting entanglement” from the field only when the detectors are not able to communicate. For massless scalar fields in flat spacetime, we show that when two detectors can communicate via the field, the detectors do not really harvest entanglement from the field, and instead they get entangled only via the field-mediated communication channel. We provide a quantitative estimator of the relative contribution of communication versus genuine entanglement harvesting. We study the role of field-mediated communication in generating entanglement between the two detectors interacting with a quantum field. We revisit the entanglement harvesting protocol when two detectors are in causal contact. Our result gives the original solution of Buchholz and Yngvason a very operational reinterpretation in terms of qubits interacting with a quantum field and allows for various natural generalizations and inclusion of detector-based local measurement for the quantum field. We show that current tools in relativistic quantum information, combined with an algebraic approach to quantum field theory, are now powerful enough to provide fuller and cleaner analysis of the Fermi two-atom problem for arbitrary curved spacetimes in a completely nonperturbative manner. It is also noted that they are all studied in flat spacetime. Some of these analyses employ various approximations, heuristics, and perturbative methods, which tends to render some of the otherwise useful insights somewhat obscured. The problem has sparked different analyses from many directions and angles since the proposed solution by Buchholz and Yngvason. In this work we revisit the famous Fermi two-atom problem, which concerns how relativistic causality impacts atomic transition probabilities, using the tools from relativistic quantum information and algebraic quantum field theory.
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