  We propose an efficient approach to prepare Einstein-Podolsky-Rosen (EPR)
pairs in currently existing Josephson nanocircuits with capacitive couplings.
In these fixed coupling circuits, two-qubit logic gates could be easily
implemented while, strictly speaking, single-qubit gates cannot be easily
realized. For a known two-qubit state, conditional single-qubit operation could
still be designed to evolve only the selected qubit and keep the other qubit
unchanged; the rotation of the selected qubit depends on the state of the other
one. These conditional single-qubit operations allow to deterministically
generate the well-known Einstein-Podolsky-Rosen pairs, represented by EPR-Bell
(or Bell) states. Quantum-state tomography is further proposed to
experimentally confirm the generation of these states. The decays of the
prepared EPR pairs are analyzed using numerical simulations. Possible
application of the generated EPR pairs to test Bell's Inequality is also
discussed.
