Emission and Absorption quantum noise measurement with an on-chip resonant circuit

Details Emission and Absorption quantum noise measurement with an on-chip resonant circuit Emission and Absorption quantum noise measurement with an on-chip resonant circuit

2010-06-04

arxiv.org/abs/1006.0892v2

Phys. Rev. Lett. 105, 166801 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.105.166801

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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