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Physics Today

Superconducting electronics

Aleksander I. Braginski

Published Jul 1, 1983• 1 citation
Publisher
DOI
10.1063/1.2915781

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Steady progress has been made in both theory and technology of superconductive electronics, but there has been little application to operational electronic systems. This paper, which was prepared for presentation at the 1976 Navy Summer Study on Superconductive Electronics, reviews those applications that might be of interest to radar. These applications include low-noise receivers, stable RF sources, MTI, synthetic aperture radar, and other areas of signal processing. Also included is a brief discussion of some of the potential problems associated with the use of such devices in a practical radar. Although there are areas of possible radar application of superconductive electronic devices, the burden of using cryogenics operationally as well as the availability of other competing electronic devices make it appear unlikely that superconducting electronics will find significant application in radar in the near future. (Author)
We analyze the current and zero-frequency current noise properties of a superconducting single-electron transistor (SSET) coupled to a resonator, focusing on the regime where the SSET is operated in the vicinity of the Josephson quasiparticle resonance. We consider a range of coupling strengths and resonator frequencies to reflect the fact that in practice the system can be tuned to quite a high degree with the resonator formed either by a nanomechanical oscillator or a superconducting stripline fabricated in close proximity to the SSET. For very weak couplings the SSET acts on the resonator like an effective thermal bath. In this regime the current characteristics of the SSET are only weakly modified by the resonator. Using a mean-field approach, we show that the current noise is nevertheless very sensitive to the correlations between the resonator and the SSET charge. For stronger couplings, the SSET can drive the resonator into limit-cycle states where self-sustained oscillation occurs and we find that regions of well-defined bistability exist. Dynamical transitions into and out of the limit-cycle state are marked by strong fluctuations in the resonator energy, but these fluctuations are suppressed within the limit-cycle state. We find that the current noise of the SSET is strongly influenced by the fluctuations in the resonator energy and hence should provide a useful indicator of the resonator's dynamics.
The Josephson quasiparticle (JQP) cycle in a voltage-biased superconducting single-electron transistor (SSET) combines coherent Cooper pair tunneling with incoherent quasiparticle decay. We have measured the influence of current flow through an independently-biased SSET on the JQP cycle when the two SSET's have a strong mutual capacitive coupling. We find, among other effects, that the JQP current in one SSET is enhanced by the presence of a quasiparticle current in the other SSET. A simplified model of the coupled-SSET system is presented which reproduces the enhancement effect.