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Ultra-sensitive detectors and readout devices based on the radio frequencysingle electron transistor (rf-SET) combine near quantum-limited sensitivitywith fast operation. Here we describe a twin rf-SET detector that uses twosuperconducting rf-SETs to perform fast, real-time cross-correlatedmeasurements in order to distinguish sub-electron signals from charge noise onmicrosecond time-scales. The twin rf-SET makes use of two tuned resonancecircuits to simultaneously and independently address both rf-SETs usingwavelength division multiplexing (WDM) and a single cryogenic amplifier. Wefocus on the operation of the twin rf-SET as a charge detector and evaluate thecross-talk between the two resonance circuits. Real time suppression of chargenoise 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 $\delta q_{SET2} = 4.4 \mue/\sqrt{Hz}$.Comment: Updated version, including new content. Comments most welcome:  tilo@jupiter.phys.unsw.edu.au or djr@jupiter.phys.unsw.edu.a

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