  Asymmetry of quantum states is a useful resource in applications such as
quantum metrology, quantum communication, and reference frame alignment.
However, asymmetry of a state tends to be degraded in physical scenarios where
environment-induced noise is described by covariant operations, e.g., open
systems constrained by superselection rules, and such degradations weaken the
abilities of the state to implement quantum information processing tasks. In
this paper, we investigate under which dynamical conditions asymmetry of a
state is totally unaffected by the noise described by covariant operations. We
find that all asymmetry measures are frozen for a state under a covariant
operation if and only if the relative entropy of asymmetry is frozen for the
state. Our finding reveals the existence of universal freezing of asymmetry,
and provides a necessary and sufficient condition under which asymmetry is
totally unaffected by the noise.
