Quantum-limited quasiparticle mixers at 100 GHz

Carl A. Mears; Qing Hu; Paul L. Richards; A. Worsham; Daniel E. Prober; Antti V. Raisanen

doi:10.1117/12.45612

1 July 1991 Quantum-limited quasiparticle mixers at 100 GHz

Carl A. Mears, Qing Hu, Paul L. Richards, A. Worsham, Daniel E. Prober, Antti V. Raisanen

Proceedings Volume 1477, Superconductivity Applications for Infrared and Microwave Devices II; (1991) https://doi.org/10.1117/12.45612
Event: Orlando '91, 1991, Orlando, FL, United States

Abstract

Accurate measurements have been made of the noise and gain of superconducting-insulating- superconducting (SIS) mixers employing small-area (1 micrometers 2) Ta/Ta2O5/Pb0.9Bi0.1 tunnel junctions. The authors have measured an added mixer noise of 0.61 +/- 0.31 quanta at 95.0 GHz, which is within 25% of the quantum limit of 0.5 quanta. A detailed comparison is made between theoretical predictions of the quantum theory of mixing and experimentally measured noise and gain. The authors used the shapes of I-V curves pumped at the upper and lower sideband frequencies to deduce values of the embedding admittances at these frequencies. Using these admittances, the mixer noise and gain predicted by quantum theory are in excellent agreement with experiment.

Citation Download Citation

Carl A. Mears, Qing Hu, Paul L. Richards, A. Worsham, Daniel E. Prober, and Antti V. Raisanen "Quantum-limited quasiparticle mixers at 100 GHz", Proc. SPIE 1477, Superconductivity Applications for Infrared and Microwave Devices II, (1 July 1991); https://doi.org/10.1117/12.45612

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