Strongly quadrature-dependent noise in superconducting micro-resonators measured at the vacuum-noise limit

Details Strongly quadrature-dependent noise in superconducting micro-resonators measured at the vacuum-noise limit Strongly quadrature-dependent noise in superconducting micro-resonators measured at the vacuum-noise limit

2010-07-31

arxiv.org/abs/1008.0046v1

Physics

Condensed Matter

Superconductivity

13 pages, 4 figures

Scientific paper

We measure frequency- and dissipation-quadrature noise in superconducting lithographed microwave resonators with sensitivity near the vacuum noise level using a Josephson parametric amplifier. At an excitation power of 100~nW, these resonators show significant frequency noise caused by two-level systems. No excess dissipation-quadrature noise (above the vacuum noise) is observed to our measurement sensitivity. These measurements demonstrate that the excess dissipation-quadrature noise is negligible compared to vacuum fluctuations, at typical readout powers used in micro-resonator applications. Our results have important implications for resonant readout of various devices such as detectors, qubits and nano-mechanical oscillators.

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