Is this possible that quantum computer will be able to violate the Church thesis?
No.  A classical computer can compute anything a quantum computer can do, given long enough.  There are simple methods of simulation that cause an exponential slowdown, which suffices to show that if it is decidable on a quantum computer, it is decidable on a classical computer.  (We don't know whether the there might be other faster ways of simulating a quantum computer on a classical computer, but that doesn't affect decidability.)