We investigate the decoherence and dephasing of two coupled Josephson qubits.
With the interaction between the qubits being generated by current-current
correlations, two different situations in which the qubits are coupled to the
same bath, or to two independent baths, are considered. Upon focussing on
dissipation being caused by the fluctuations of voltage sources, the relaxation
and dephasing rates are explicitly evaluated. Analytical and numerical results
for the coupled qubits dynamics are provided.Comment: 18 pages, 8 figures include
