Abstract
Abstract Quantum information processing using superconducting qubit based on Josephson junctionhas become one of the most promising candidates for possible realization of a quantum computer. In the heart of the qubit circuits, the superconducting microwave resonator plays a key role in quantum operations and measurementswhich , enables single-photon level microwave quantum optics. During last decade, t he coherence time, or the lifetime of the quantum state, of the superconducting qubit has been dramatically improved. Among several technological innovations, improvement of superconducting microwave resonatorthe ’s quality has been the main driving force in the gettingqubit performance almost ready for elementary quantum computing architecture. In this paper, I will briefly review very recent progresses of the superconducting microwave resonators especially aimed for quantum device applications during the last decadeThe progresses have been driven by ingenious circuit d. gn, esimaterial improvement, and new measurement techniques. Even a rather radical idea of three-dimensional large resonators have been successfully implemented in a qubit circuit. All those efforts contributed our understanding of the qubit decoherence to mechanism and as a result to the improvement of qubit performance.
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