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Springer eBooks

Test Of An rf-Squid System With Stroboscopic One-Shot Readout Under Microwave Irradiation

P. Carelli, Maria Gabriella Castellano, F. Chiarello, C. Cosmelli, Roberto Leoni, F. Sciamanna, Claudia Scilletta, G. Torrioli

Published Jan 1, 2004• 1 citation
Publisher
DOI
10.1007/978-1-4419-9092-1_5

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The flux states of a rf superconducting quantum interference device (SQUID) can be used to investigate macroscopic quantum effects, the most challenging of which is the detection of quantum coherent oscillations, and are promising candidates for the implementation of quantum computing. The use of a proper readout system is of utmost importance for these purposes. In this letter we present experimental evidence of the possibility of using an underdamped, hysteretic dc SQUID to read out stroboscopically the flux states of a rf SQUID, allowing a single shot discrimination with an efficiency of 98%. The devices are all integrated on chip.
The layout and construction of a readout electronics for rf superconducting quantum interference devices (SQUIDs) with bias frequencies of 3 GHz are described. The electronics uses standard electronic components and can be aligned using a spectrum analyzer. Differences between a conventional 20-MHz electronics and this microwave readout are explained. Each individual circuit block is described and circuit diagrams as well as information for pc-board layout is given. A brief description of thin-film rf-SQUIDs used for experiments with this readout electronics is also included.