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Superconducting quantum interference devices based set-up for probing current noise and correlations in three-terminal devices

Andreas Pfeffer 1 Bhaskar Kaviraj 1 Olivier Coupiac 1 François Lefloch 1
1 LaTEQS - Laboratoire de Transport Electronique Quantique et Supraconductivité
PHELIQS - PHotonique, ELectronique et Ingénierie QuantiqueS : DRF/IRIG/PHELIQS
Abstract : We have implemented a new experimental set-up for precise measurements of current fluctuations in three-terminal devices. The system operates at very low temperatures (30 mK) and is equipped with three superconducting quantum interference devices (SQUIDs) as low noise current amplifiers. A SQUID input coil is connected to each terminal of a sample allowing the acquisition of time-dependent current everywhere in the circuit. From these traces, we can measure the current mean value, the noise, and cross-correlations between different branches of a device. In this paper, we present calibration results of noise and cross-correlations obtained using low impedance macroscopic resistors. From these results, we can extract the noise level of the set-up and show that there are no intrinsic correlations due to the measurement scheme. We also studied noise and correlations as a function of a dc current and estimated the electronic temperature of various macroscopic resistors.
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Andreas Pfeffer, Bhaskar Kaviraj, Olivier Coupiac, François Lefloch. Superconducting quantum interference devices based set-up for probing current noise and correlations in three-terminal devices. Review of Scientific Instruments, American Institute of Physics, 2012, 83 (11), pp.115107. ⟨10.1063/1.4766334⟩. ⟨hal-00790518⟩

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