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Article Dans Une Revue Review of Scientific Instruments Année : 2012

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

Résumé

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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Dates et versions

hal-00790518 , version 1 (20-02-2013)

Identifiants

Citer

Andreas H. 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, 2012, 83 (11), pp.115107. ⟨10.1063/1.4766334⟩. ⟨hal-00790518⟩
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