Emission and Absorption Quantum Noise Measurement with an On-Chip Resonant Circuit

J. Basset, H. Bouchiat, and R. Deblock
Phys. Rev. Lett. 105, 166801 – Published 11 October 2010

Abstract

Using a quantum detector, a superconductor-insulator-superconductor junction, we probe separately the emission and absorption noise in the quantum regime of a superconducting resonant circuit at equilibrium. At low temperature the resonant circuit exhibits only absorption noise related to zero point fluctuations, whereas at higher temperature emission noise is also present. By coupling a Josephson junction, biased above the superconducting gap, to the same resonant circuit, we directly measure the noise power of quasiparticles tunneling through the junction at two resonance frequencies. It exhibits a strong frequency dependence, consistent with theoretical predictions.

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  • Received 2 June 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.166801

© 2010 The American Physical Society

Authors & Affiliations

J. Basset, H. Bouchiat, and R. Deblock

  • Laboratoire de Physique des Solides, Université Paris-Sud, CNRS, UMR 8502, F-91405 Orsay Cedex, France

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Issue

Vol. 105, Iss. 16 — 15 October 2010

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