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Entanglement Entropy due to the Presence of Static Quarks
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abstract
We study the entanglement of gluon fields in presence of a static $Q\bar Q$ pair in quenched QCD. Using the replica method, we investigate the $q=2$ Renyi entropy of the entanglement of gluon fields inside and in the vicinity of the confining QCD string between the quark and the antiquark. We find that there is excess entropy of gluon entanglement compared to vacuum fluctuations. This excess of entanglement entropy is associated with the gluon flux tube, and we find that it has a finite non-zero value in the continuum. We investigate the dependence of gluon entanglement on the geometry of longitudinal and transverse partitioning of the flux tube. Our preliminary results suggest scaling of the entanglement entropy with the area of the boundary overlapping with the flux tube.
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Internal color contributions to flux tube entanglement entropy
Preliminary lattice data support the conjecture that the internal color entanglement entropy of a flux tube equals <F> log N_c, where <F> is the average number of boundary crossings.
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