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John Martinis, UC Santa Barbara, states that the Josephson junction is an ideal solid-state system for building "electrical atoms" that can function as quantum bits for a quantum computer. Recent advances in the materials and design of phase qubits have dramatically improved their coherence so that high-fidelity quantum logic operations can be performed. Combined with advances in microwave electronics, full characterization of single and coupled qubit logic gates are now possible using quantum tomography techniques. He reports on several recent experiments of his group demonstrating tomographic state measurement of single and coupled qubit logic gates that provide direct proof of entanglement. The group believes this experimental approach has unique advantages because the cubit has 50 ohm impedance, which enables the use of simple qubit coupling over long distance. With only modest improvements, scaling up the number of qubits can begin, to start testing more complex quantum algorithms.

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