Ultimate on-chip quantum amplifier

O. V. Astafiev, A. A. Abdumalikov, A. M. Zagoskin, Yu A. Pashkin, Y. Nakamura, J. S. Tsai

Research output: Contribution to journalArticlepeer-review

96 Citations (Scopus)


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.

Original languageEnglish
Article number183603
JournalPhysical Review Letters
Issue number18
Publication statusPublished - 6 May 2010
Externally publishedYes


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