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We investigate the fate of initial entanglement between two accelerateddetectors with respect to an observer attached to one of the detectors. Both$(1+1)$ and $(1+3)$ spacetime dimensions are being considered here, with thedetectors interacting with real massless scalar fields through monopole terms.The investigation is being performed for both non-thermal as well as thermalfields. In general, irrespective of the detectors moving in the same Rindlerwedge or opposite wedges, increase of the field temperature reduces the initialentanglement. In all situations, degradation of entanglement is high for highacceleration $a_A$ of our observer. Interestingly, the degradation depends onthe measure of initial entanglement. For $(1+1)$ dimensions, the degradationsaturates for small values of $a_A$, whereas the same fluctuates in $(1+3)$dimensions with the decrease of $a_A$. For motions in opposite Rindler wedges,a noticeable feature we observe in $(1+1)$ dimensions is that, depending on thestrength of initial entanglement, there is a possibility of entanglementharvesting in the system for certain values of the observers' acceleration.However the same is absent in $(1+3)$ dimensions. The whole analysis isoperationally different from earlier similar investigations. The thermalequilibrium is satisfied throughout the calculations here, by considering theWightman functions with respect to the Rindler modes evaluated in the vacuum ofUnruh modes, contrary to the use of Minkowski modes.

Fate of entanglement between two Unruh-DeWitt detectors due to their motion and background temperature