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This study proposes a realistic model for entanglement harvesting in superconducting circuits, bridging the gap between theoretical Unruh-DeWitt models and practical quantum hardware implementations. The research demonstrates that while energy gap variations limit harvesting in spacelike-separated scenarios, causally connected detectors can still generate entanglement directly from field correlations. These findings provide a concrete roadmap for near-future laboratory experiments to verify genuine entanglement harvesting using existing superconducting technology.
Towards an experimental implementation of entanglement harvesting in superconducting circuits: effect of detector gap variation on entanglement harvesting
arXiv:2505.01516v2 Announce Type: replace Abstract: Motivated by the prospect of experimental implementations of entanglement harvesting in superconducting circuits, we propose a model of variable-gap particle detector that aims to bridge some of the gaps between Unruh-DeWitt (UDW) models and realistic implementations. Using parameters tailored to potential experimental setups, we investigate entanglement harvesting in both spacelike-separated and causally connected scenarios. Our findings reveal that while variations in the energy gap reduce the ability to harvest entanglement for spacelike-separated detectors, detectors in causal contact can still become entangled through their interaction with the field. Notably, our analysis shows that (due to the derivative coupling nature of the model) even for causally connected detectors, the entanglement primarily originates from the field's correlations. This demonstrates the potential for genuine entanglement harvesting in the lab and opens the door to near-future entanglement harvesting experiments in superconducting circuits.
Abstract:Motivated by the prospect of experimental implementations of entanglement harvesting in superconducting circuits, we propose a model of variable-gap particle detector that aims to bridge some of the gaps between Unruh-DeWitt (UDW) models and realistic implementations. Using parameters tailored to potential experimental setups, we investigate entanglement harvesting in both spacelike-separated and causally connected scenarios. Our findings reveal that while variations in the energy gap reduce the ability to harvest entanglement for spacelike-separated detectors, detectors in causal contact can still become entangled through their interaction with the field. Notably, our analysis shows that (due to the derivative coupling nature of the model) even for causally connected detectors, the entanglement primarily originates from the field's correlations. This demonstrates the potential for genuine entanglement harvesting in the lab and opens the door to near-future entanglement harvesting experiments in superconducting circuits.
38 Pages, 24 Figures, 5 Appendices. RevTeX 4.2. (v2: updated to match published version, fixed typos)
arXiv:2505.01516 [quant-ph]
(or arXiv:2505.01516v2 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2505.01516 Focus to learn more arXiv-issued DOI via DataCite
Phys. Rev. A 113, 043732 (2026)
https://doi.org/10.1103/wv9n-k3jj Focus to learn more DOI(s) linking to related resources
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Full text under the publisher's open licence · 258 words
