Ultimate On-Chip Quantum Amplifier

O. V. Astafiev, A. A. Abdumalikov, Jr., A. M. Zagoskin, Yu. A. Pashkin, Y. Nakamura, and J. S. Tsai
Phys. Rev. Lett. 104, 183603 – Published 6 May 2010
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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.

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  • Received 14 January 2010

DOI:https://doi.org/10.1103/PhysRevLett.104.183603

©2010 American Physical Society

Authors & Affiliations

O. V. Astafiev1, A. A. Abdumalikov, Jr.2,†, A. M. Zagoskin3, Yu. A. Pashkin1,*, Y. Nakamura1, and J. S. Tsai1

  • 1NEC Nano Electronics Research Laboratories, Tsukuba, Ibaraki 305-8501, Japan and RIKEN Advanced Science Institute, Tsukuba, Ibaraki 305-8501, Japan
  • 2RIKEN Advanced Science Institute, Tsukuba, Ibaraki 305-8501, Japan
  • 3Department of Physics, Loughborough University, Loughborough, LE11 3TU Leicestershire, United Kingdom

  • *On leave from Lebedev Physical Institute, Moscow 119991, Russia.
  • On leave from the Physical-Technical Institute, Tashkent 100012, Uzbekistan.

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Issue

Vol. 104, Iss. 18 — 7 May 2010

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