Abstract
We investigate how entanglement in the mixed state of a quantum field theory can be described using the cross-computable norm or realignment (CCNR) criterion, employing a recently introduced negativity. We study its symmetry resolution for two disjoint intervals in the ground state of the massless Dirac fermion field theory, extending previous results for the case of adjacent intervals. By applying the replica trick, this problem boils down to computing the charged moments of the realignment matrix. We show that, for two disjoint intervals, they correspond to the partition function of the theory on a torus with a non-contractible charged loop. This confers a great advantage compared to the negativity based on the partial transposition, for which the Riemann surfaces generated by the replica trick have higher genus. This result empowers us to carry out the replica limit, yielding analytic expressions for the symmetry-resolved CCNR negativity. Furthermore, these expressions provide also the symmetry decomposition of other related quantities such as the operator entanglement of the reduced density matrix or the reflected entropy.
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Acknowledgments
We thank Clement Berthiere, Jerome Dubail, Michele Fossati, Gilles Parez and Federico Rottoli for useful discussions. PC and FA acknowledge support from ERC under Consolidator Grant number 771536 (NEMO). SM thanks the support from the Caltech Institute for Quantum Information and Matter and the Walter Burke Institute for Theoretical Physics at Caltech.
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Bruno, A., Ares, F., Murciano, S. et al. Symmetry resolution of the computable cross-norm negativity of two disjoint intervals in the massless Dirac field theory. J. High Energ. Phys. 2024, 9 (2024). https://doi.org/10.1007/JHEP02(2024)009
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DOI: https://doi.org/10.1007/JHEP02(2024)009