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Physics Bulletin

Superconducting Quantum Interference Devices and their Applications

John Ryder Waldram

Published Feb 1, 1982• 193 citations
Publisher

Abstract

H D Hahlbohm and H Lubbig 1981 Berlin: Walter de Gruyter xxviii + 990 pp price DM220 This volume contains the 74 papers given at SQUID '80, the second conference on superconducting quantum devices, held in Berlin last year. No dramatic new ideas appeared, but the technical progress made in the four years since SQUID '76 is impressive, and specialists will buy the volume for the sake of the substantial invited review papers, especially those by Clark on SQUID performance (now at the quantum limit) and Giffard on simplified SQUID circuit design; by the IBM and Bell groups on dazzling new manufacturing techniques; by Van Duzer on up to the minute computer applications; and by Pederson on most of the RF applications.

DOI
10.1088/0031-9112/33/2/039

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H D Hahlbohm and H Lubbig 1981 Berlin: Walter de Gruyter xxviii + 990 pp price DM220 This volume contains the 74 papers given at SQUID '80, the second conference on superconducting quantum devices, held in Berlin last year. No dramatic new ideas appeared, but the technical progress made in the four years since SQUID '76 is impressive, and specialists will buy the volume for the sake of the substantial invited review papers, especially those by Clark on SQUID performance (now at the quantum limit) and Giffard on simplified SQUID circuit design; by the IBM and Bell groups on dazzling new manufacturing techniques; by Van Duzer on up to the minute computer applications; and by Pederson on most of the RF applications.
It is well known that the electrodynamic properties of SQUIDs (Superconducting Quantum Interference Devices) are obtained by means of the dynamics of the Josephson junctions in these superconducting system (Barone & Paterno, 1982; Likharev, 1986; Clarke & Braginsky, 2004). Due to the intrinsic macroscopic coherence of superconductors, r. f. SQUIDs have been proposed as basic units (qubits) in quantum computing (Bocko et al., 1997). In the realm of quantum computing non-dissipative quantum systems with small (or null) inductance parameter and finite capacitance of the Josephson junctions (JJs) are usually considered (Crankshaw & Orlando, 2001). The mesoscopic non-simply connected classical devices, on the other hand, are generally operated and studied in the overdamped limit with negligible capacitance of the JJs and small (or null) values of the inductance parameter. Nonetheless, r. f. SQUIDs find application in a large variety of fields, from biomedicine to aircraft maintenance (Clarke & Braginsky, 2004), justifying actual scientific interest in them.
Quantum information processing using superconducting qubit based on Josephson junction has 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 measurements, which enables single-photon level microwave quantum optics. During last decade, the coherence time, or the lifetime of the quantum state, of the superconducting qubit has been dramatically improved. Among several technological innovations, the improvement of superconducting microwave resonator's quality has been the main driving force in getting the qubit 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 decade. The progresses have been driven by ingenious circuit design, material 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 to our understanding of the qubit decoherence mechanism and as a result to the improvement of qubit performance.