Journal
SCIENCE
Volume 301, Issue 5630, Pages 203-206Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1084175
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The electrical noise of mesoscopic devices can be strongly influenced by the quantum motion of electrons. To probe this effect, we have measured the current fluctuations at high frequency ( 5 to 90 gigahertz) using a superconductor-insulatorsuperconductor tunnel junction as an on-chip spectrum analyzer. By coupling this frequency-resolved noise detector to a quantum device, we can measure the high-frequency, nonsymmetrized noise as demonstrated for a Josephson junction. The same scheme is used to detect the current fluctuations arising from coherent charge oscillations in a two-level system, a superconducting charge qubit. A narrow band peak is observed in the spectral noise density at the frequency of the coherent charge oscillations.
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