  The uncertainty principle, first introduced by Heisenberg in inertial frames,
clearly distinguishes quantum theories from classical mechanics. In
non-inertial frames, its information-theoretic expressions, namely entropic
uncertainty relations, have been extensively studied through delocalized
quantum fields, and localization of the quantum fields were discussed as well.
However, infeasibility of measurements applied on a delocalized quantum field
due to the finite size of measurement apparatuses is left unexplained.
Therefore, physical clarification of a quantum protocol revealing entropic
uncertainty relations still needs investigation. Building on advances in
quantum field theories and theoretical developments in entropic uncertainty
relations, we demonstrate a relativistic protocol of an uncertainty game in the
presence of localized fermionic quantum fields inside cavities. Moreover, a
novel lower bound for entropic uncertainty relations with multiple quantum
memories is given in terms of the Holevo quantity, which implies how
acceleration affects uncertainty relations.
