Josephson junctions interference device

The superconducting quantum interference device (SQUID) is formed from a superconducting loop containing at least one Josephson junction. Basically, a SQUID amplifier converts an input current to an output voltage with a transresistance of the order of 107 V/A. The input noise is of the order of 10-11 A/(Hz)1/2. The bandwidth of the SQUID amplifier can be up to 80kHz. The dynamic range in 1 Hz bandwidth can be 150dB. [Pg.319]

An application of Josephson junctions is in superconducting quantum interference devices (SQUIDS). Figure 4.61 shows two Josephson junctions passing a current with a magnetic induction B, through the ring of area A. [Pg.233]

Fig. 4.61 Two Josephson junctions comprising a superconducting quantum interference device (SQUID).

The simplest superconducting flux qubit is a superconducting loop interrupted by one Josephson junction (radiofrequency rf-SQUID - SQUID is an acronym for superconducting quantum interference device). The potential energy of such a devices is described by the equation ... [Pg.623]

The next step in the development of high thin-film devices after the optimization of single layer films is the introduction of defects in precisely defined positions in order locally to alter the properties of the superconductor. The use of grain boundaries as Josephson junctions in SQUlDs (Superconducting Quantum Interference Devices) is an example of how defects can be utilized. [Pg.367]

V. Bouchiat, M. Faucher, C. Thirion, W. Wernsdorfer, T. Fournier, and B. Pannetier, Josephson junctions and superconducting quantum interference devices made by local oxidation of niobium ultrathin films, Appl. Phys. Lett, 79,123-125 [2001],... [Pg.523]

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