Detection of quantum noise from mesoscopic devices with an SIS detector

Details Detection of quantum noise from mesoscopic devices with an SIS detector Detection of quantum noise from mesoscopic devices with an SIS detector

2004-05-26

arxiv.org/abs/cond-mat/0405601v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 2 figures, to appear in the proceedings of the XXXIXth Rencontres de Moriond (La Thuile, 2004) "Quantum information a

Scientific paper

Quantum mechanics can strongly influence the noise properties of mesoscopic devices. To probe this effect we have measured the current fluctuations at high-frequency (5-90G Hz) using a superconductor-insulator-superconductor 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, non-symmetrized noise as demonstrated for a Josephson junction. The same scheme has been used to detect the current fluctuations arising from coherent charge oscillations in a two-level system, a superconducting charge qubit. A narrow band peak was observed in the spectral noise density at the frequency of the coherent charge oscillations.

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