Strongly quadrature-dependent noise in superconducting microresonators measured at the vacuum-noise limit
Abstract
We measure frequency- and dissipation-quadrature noise in superconducting microresonators with sensitivity near the vacuum noise level using a Josephson parametric amplifier. At an excitation power of 100 nW, frequency noise rises orders of magnitude above the vacuum noise, but no excess dissipation-quadrature noise is observed above the vacuum noise level. Our results suggest that using quantum amplifiers in dissipation measurement may greatly improve the sensitivity of microresonator readout, which has important implications for applications such as detectors, qubits, and nanomechanical oscillators.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 06, 2011
- Source ID
- 10.1063/1.3597156
Entities
People
- D. R. Schmidt
- F. Mallet
- G. C. Hilton
- H. G. Leduc
- J. A. B. Mates
- J. Zmuidzinas
- Jian Gao
- K. D. Irwin
- Konrad W. Lehnert
- L. R. Vale
- M. A. Castellanos-beltran
Organizations
- California Institute of Technology
- Defense Advanced Research Projects Agency
- National Institute of Standards and Technology
- University of Colorado