Fermionic entanglement ambiguity in non-inertial frames

Abstract

We analyse an ambiguity in previous works on entanglement of fermionic fields in non-inertial frames. This ambiguity, related to the anticommutation properties of field operators, leads to non-unique results when computing entanglement measures for the same state. We show that the ambiguity disappears when we introduce detectors, which are in any case necessary as a means to probe the field entanglement.

9 pages, 4 figures. Revtex 4.1, added Journal reference

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