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oct07-offprint-zagoskin.pdf

In special conditions, global degrees of freedom of small electrical circuits can behave quantum mechanically and could be used as quantum bits (qubits) for quantum information processing.  Prime examples are circuits based on superconducting materials.  Such superconducting qubits have been demonstrated experimentally with single, and more recently, two-qubit logical operations being performed coherently with them.  Here, we will review the three type of superconducting qubits currently being studied: charge, flux and phase qubits.  Single-qubit gates, coherent interaction of qubits, as well as the readout process will be discussed.