Development and operation of the twin radio frequency single electron transistor for solid state qubit readout

Details Development and operation of the twin radio frequency single electron transistor for solid state qubit readout Development and operation of the twin radio frequency single electron transistor for solid state qubit readout

2003-02-04

arxiv.org/abs/cond-mat/0302085v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Updated version, including new content. Comments most welcome: tilo@jupiter.phys.unsw.edu.au or djr@jupiter.phys.unsw.edu.au

Scientific paper

10.1063/1.1786671

Ultra-sensitive 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 sub-electron 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 (WDM) 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 $\delta q_{SET1} = 7.5 \mu e/\sqrt{Hz}$ and $\delta q_{SET2} = 4.4 \mu e/\sqrt{Hz}$.

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