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Ultimate On-Chip Quantum Amplifier

Research output: Contribution to journalJournal article


  • O. V. Astafiev
  • A. A. Abdumalikov
  • A. M. Zagoskin
  • Yuri Pashkin
  • Y. Nakamura
  • J. S. Tsai
Article number183603
Journal publication date7/05/2010
JournalPhysical review letters
Number of pages4
Original languageEnglish


We report amplification of electromagnetic waves by a single artificial atom in open 1D space. Our three-level artificial atom-a superconducting quantum circuit-coupled to a transmission line presents an analog of a natural atom in open space. The system is the most fundamental quantum amplifier whose gain is limited by a spontaneous emission mechanism. The noise performance is determined by the quantum noise revealed in the spectrum of spontaneous emission, also characterized in our experiments.