We describe the construction and operation of a two-channel noise detection system for measuring power and cross spectral densities of current fluctuations near 2MHz in electronic devices at low temperatures. The system employs cryogenic amplification and fast Fourier transform based spectral measurement. The gain and electron temperature are calibrated using Johnson noise thermometry. Full shot noise of 100pA can be resolved with an integration time of 10s. We report a demonstration measurement of bias-dependent current noise in a gate defined GaAs∕AlGaAs quantum point contact.
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DiCarlo et al. (2006) studied this question.
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