Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-08-29
Phys. Rev. Lett. 96, 136804 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Revtex4, 4 figures
Scientific paper
10.1103/PhysRevLett.96.136804
We measure current fluctuations of mesoscopic devices in the quantum regime, when the frequency is of the order of or higher than the applied voltage or temperature. Detection is designed to probe separately the absorption and emission contributions of current fluctuations, i.e. the positive and negative frequencies of the Fourier transformed nonsymmetrized noise correlator. It relies on measuring the quasiparticles photon assisted tunneling current across a superconductor-insulator-superconductor junction (the detector junction) caused by the excess current fluctuations generated by quasiparticles tunneling across a Josephson junction (the source junction). We demonstrate unambiguously that the negative and positive frequency parts of the nonsymmetrized noise correlator are separately detected and that the excess current fluctuations of a voltage biased Josephson junction present a strong asymmetry between emission and absorption.
Billangeon P.-M.
Bouchiat Helene
Deblock Richard
Pierre Frédéric
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