Send to:

Choose Destination
See comment in PubMed Commons below
Phys Rev Lett. 2010 May 7;104(18):183603. Epub 2010 May 6.

Ultimate on-chip quantum amplifier.

Author information

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


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.

PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for American Physical Society
    Loading ...
    Write to the Help Desk