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Phys Rev Lett. 2010 May 7;104(18):183603. Epub 2010 May 6.

Ultimate on-chip quantum amplifier.

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  • 1NEC Nano Electronics Research Laboratories, Tsukuba, Ibaraki 305-8501, Japan.

Abstract

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.

PMID:
20482174
[PubMed]
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