Ultimate on-chip quantum amplifier

Details Ultimate on-chip quantum amplifier Ultimate on-chip quantum amplifier

2010-04-22

arxiv.org/abs/1004.3864v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures + supplemenntary materials accepted for publication in Phys. Rev. Lett.

Scientific paper

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.

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