Josephson junction microwave amplifier in self-organized noise compression mode

Pasi Lähteenmäki, Visa Vesterinen, Juha Hassel, Heikki Seppä, Pertti Hakonen

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
21 Downloads (Pure)


The fundamental noise limit of a phase-preserving amplifier at frequency is the standard quantum limit . In the microwave range, the best candidates have been amplifiers based on superconducting quantum interference devices (reaching the noise temperature at 700 MHz), and non-degenerate parametric amplifiers (reaching noise levels close to the quantum limit 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, 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.
Original languageEnglish
Article number276
Pages (from-to)1-5
Number of pages5
JournalScientific Reports
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed


  • amplification
  • frequency
  • parametric-amplifier
  • quantum limit
  • tunnel-junctions

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