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We study Quantum Chromodynamics (QCD) with 2+1 flavors with almost physicalquark masses using the highly improved staggered quark action (HISQ). Wecalculate the Polyakov loop in a wide temperature range, obtain the free energyand the entropy of a single static quark and discuss the QCD crossover regionin detail. We show that the entropy has a peak close to the chiral crossoverand consider the consequences for the deconfinement aspects of the crossoverphenomena. We study the renormalized Polyakov loop susceptibilities and placethem into the context of the crossover. We also obtain a quantitative resultfor the onset of weak coupling behavior at high temperatures.

Single quark entropy and the Polyakov loop