Abstract
Under the right parametric conditions a Josephson Junction (JJ) can act as a qubit as it reduces to a two-state quantum system, which is the very basic required feature for any system to act as a qubit. In this paper we shall investigate the ground state energy of a new Josephson junction array (JJA) design, dubbed “4 × 4” flux qubit, using Diffusion Monte Carlo (DMC) method. Technical details of the DMC calculation of the ground state energy shall be presented. The ground state energy calculated with the DMC code is shown to be consistent with known results calculated using Lanczos method by other authors for similar JJA with a smaller degrees of freedom (d.o.f).
Published Version
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