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Development and operation of the twin radio frequency single electron transistor for cross-correlated charge detection

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7 Author(s)
Buehler, T.M. ; Centre for Quantum Computer Technology, Schools of Physics and Electrical Engineering & Telecommunications, University of New South Wales, Sydney 2052, Australia ; Reilly, D.J. ; Starrett, R.P. ; Court, N.A.
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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


Published in:

Journal of Applied Physics  (Volume:96 ,  Issue: 8 )