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The superconducting Josephson junction has been demonstrated to be a strongcandidate for building quantum bits or "qubits" which are the components of afuture quantum computer. In recent years, considerable theoretical andexperimental effort have been focused on studying quantum properties of singlequbits and two coupled solid-state qubits. We present results of numericalsimulations of the energy spectra of more three phase qubits that arecapacitively-coupled in different configurations. We discuss the ensuingentanglement between component qubits as manifested in avoided crossings andhow these may play a role in building gates and transmitting qubit stateinformation.

Energies and Entanglement in Multiply-coupled Phase Qubit Systems