When entanglement harvesting is not really harvesting

• URL: http://arxiv.org/abs/2109.11561v3
• Date: Tue, 30 May 2023 18:39:47 GMT
• Title: When entanglement harvesting is not really harvesting
• Authors: Erickson Tjoa and Eduardo Mart\'in-Mart\'inez
• Abstract summary: We revisit the entanglement harvesting protocol when two detectors are in causal contact. We show that when two detectors can communicate via the field, the detectors get entangled only via the field-mediated communication channel. In contrast, for massive scalar fields both communication and genuine harvesting contribute equally to the bipartite entanglement when the detectors are causally connected.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We revisit the entanglement harvesting protocol when two detectors are in causal contact. We study the role of field-mediated communication in generating entanglement between the two detectors interacting with a quantum field. We provide a quantitative estimator of the relative contribution of communication versus genuine entanglement harvesting. 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. 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. In contrast, for massive scalar fields both communication and genuine harvesting contribute equally to the bipartite entanglement when the detectors are causally connected. These results emphasize the importance of taking into account the causal relationships between two parties involved in this relativistic quantum information protocol before we can declare that it is truly entanglement harvesting.

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