Josephson junction qubits with symmetrized couplings to a resonant LC bus

Abstract

We investigate the dynamics of a scalable quantum computer employing Josephson junction (JJ) prism qubits coupled to resonant LC buses. The basic qubit states are the symmetric ground |0 and antisymmetric excited |1 states of a two triangular cell JJ prism qubit. The physical qubits are paired into logical qubits that operate in a decoherence free subspace. The circulating currents, corresponding to the |0 and |1 physical qubit states, follow the perimeter of the qubit, and are symmetric with respect to the flux threading the two cells of the qubit. © 2006 Springer Science+Business Media, Inc.