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Harvesting entanglement from complex scalar and fermionic fields with linearly coupled particle detectors

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arxiv 2111.12779 v4 pith:XAVOIJ2P submitted 2021-11-24 quant-ph gr-qchep-th

classification quant-phgr-qchep-th
keywords complexdetectorsentanglementfermionicfieldharvestingparticlescalar
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We explore entanglement harvesting with particle detectors that couple linearly to non-Hermitian fields. Specifically, we analyze the case of particle detectors coupled to a complex scalar quantum field and to a spin 1/2 fermionic field. We find that the complex scalar model can be a good approximation for the fermionic model in the protocol of entanglement harvesting when the mass of the field is sufficiently large compared to the inverse interaction time. Moreover, we show that by taking advantage of the U(1) degree of freedom of a complex detector it is possible to increase the harvested negativity by up to two orders of magnitude when compared to the case of a real detector.

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  1. Can spacetime fluctuations generate entanglement between co-moving accelerated detectors?

    gr-qc 2025-04 conditional novelty 6.0 of 10

    Two uniformly accelerated Unruh-DeWitt detectors in nested Rindler frames harvest shift-independent entanglement from the Rindler vacuum whenever their trajectories are separated by any nonzero amount.

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