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In this paper we introduce a new procedure on precise analysis of variousphysical manifestations in superconducting Qubits using the concept of Feynmanpath integral in quantum mechanics and quantum field theory. Three specificproblem are discussed, we devote the main efforts to studying the wave functionand imaginary part of the energy of the pseudo ground state of the Hamiltonianin Phase Qubits and we estimate decay rate, and thus the life time of metastable states using the approach of 't Hooft's Instantons model. Correction tothe Tilted-Washboard potential and current of Phase Qubits by precise analysisof Ginzburg-Landau's free energy equation has been considered. Also we evaluatethe most accurate value of energy levels and wave function in Charge and FluxQubits by Semi classical approximation in path integral formalism byconsidering limits of experimental errors, comparing them with WKB results andfinally, we try to study more specific the evolution of spectrum of Hamiltonianin time after addition of interaction Hamiltonian, in order to obtain the highfidelity quantum gates.

Feynman Path Integral Approach on Superconducting Qubits and Readout Process