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JOURNAL OF APPLIED PHYSICS
Volume 96, Issue 8, Pages 4508-4513Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1786671
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Ultrasensitive detectors and readout devices based on the radio frequency single electron transistor (rf-SET) combine near quantum-limited sensitivity with fast operation. Here we describe a twin rf-SET detector that uses two superconducting rf-SETs to perform fast, real-time cross-correlated measurements in order to distinguish subelectron signals from charge noise on microsecond time scales. The twin rf-SET makes use of two tuned resonance circuits to simultaneously and independently address both rf-SETs using wavelength division multiplexing and a single cryogenic amplifier. We focus on the operation of the twin rf-SET as a charge detector and evaluate the cross talk between the two resonance circuits. Real-time suppression of charge noise is demonstrated by cross correlating the signals from the two rf-SETs. For the case of simultaneous operation, the rf-SETs had charge sensitivities of deltaq(SET1)=7.5mue/rootHz and deltaq(SET2)=4.4mue/rootHz. (C) 2004 American Institute of Physics.
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