Does quantum physics contradict B theory of time( or any other version of eternalism)? If it contradicts, then is it possible that B theory of time( or any other version of eternalism) is still applicable in the domain that concerns our everyday experience but it is not applicable in quantum scale?
Contrary to some of the comments given above, quantum theory does involve a theory of time. Time is often used as a parameter labeling the set of states of a quantum system, but this is problematic because time is measured using clocks which are physical systems. So quantum theory is incomplete without a theory of time and clocks.
A quantum theory of clocks was proposed by Don Page and William Wootters in 1983 and has been improved since then:
The short version is that quantum mechanics implies the existence of other universes and any given time is a special cases in the set of universes universes that contains records of previous times but not future times. See the paper above and chapter 11 of "The Fabric of Reality" by David Deutsch. As such, all times exist. They don't go in and out of existence. This sounds somewhat like the b theory of time.