A two-state quantum system has energy eigenvalues is \(\pm \epsilon \) corresponding to the normalized states \(|\psi_{\pm} > \). At time t=0, the system is in quantum state \(\frac{1}{\sqrt{2}} (|\psi_{+}> + |\psi_{-}> ) \). The probability that the system will be in the same state at \(t= h/ 6\epsilon \) is