  The quantum dynamics of quasi-one-dimensional ring with varying electron
filling factor is investigated in presence of external electric field. The
system is modeled within Hubbard Hamiltonian with attractive Coulomb
correlation, which results in superconducting ground state when away from
half-filling. The electric field is induced by applying time-dependent
Aharonov-Bohm flux in the perpendicular direction. To explore the
non-equilibrium phenomena arising from the field, we adopt exact
diagonalization and Crank-Nicolson numerical method. With increase in electric
field strength, the electron pairs, a signature of superconducting phase, start
breaking and the system enters into a metallic phase. However, the strength of
the electric field for this quantum phase transition depends on the electronic
correlation. This phenomenon has been confirmed by flux-quantization of
time-dependent current and pair correlation functions
