Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.166801
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Funding
- ANR [ANR-09-BLAN-0199-01]
- C'Nano IdF
- Agence Nationale de la Recherche (ANR) [ANR-09-BLAN-0199] Funding Source: Agence Nationale de la Recherche (ANR)
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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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