Josephson junction microwave amplifier in self-organized noise compression mode.

Scientific Reports
Pasi LähteenmäkiP J Hakonen

Abstract

The fundamental noise limit of a phase-preserving amplifier at frequency [Formula: see text] is the standard quantum limit [Formula: see text]. In the microwave range, the best candidates have been amplifiers based on superconducting quantum interference devices (reaching the noise temperature [Formula: see text] at 700 MHz), and non-degenerate parametric amplifiers (reaching noise levels close to the quantum limit [Formula: see text] at 8 GHz). We introduce a new type of an amplifier based on the negative resistance of a selectively damped Josephson junction. Noise performance of our amplifier is limited by mixing of quantum noise from Josephson oscillation regime down to the signal frequency. Measurements yield nearly quantum-limited operation, [Formula: see text] at 2.8 GHz, owing to self-organization of the working point. Simulations describe the characteristics of our device well and indicate potential for wide bandwidth operation.

References

Mar 1, 1989·Physical Review A: General Physics·B YurkeE A Whittaker
Mar 1, 1994·Physical Review. B, Condensed Matter·F C WellstoodJ Clarke
Apr 7, 2010·Physical Review Letters·S J AsztalosJ Clarke

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