Josephson-junction qubits with controlled couplings.

Presents a proposal for solid-state qubits that utilizes controllable, low-capacitance Josephson junctions. Hypothetical composition of a quantum computer of coupled, two-state quantum systems or qubits; Exploitation of coherent tunnelling of Cooper pairs in the superconducting state by the design; Employment of control mechanisms of single-charge devices; Control of single- and two-bit operations by gate voltages.