  The radio frequency single electron transistor (rf-SET) possesses key
requirements necessary for reading out a solid state quantum computer. This
work explores the use of the rf-SET as a single-shot readout device in the
presence of 1/f and telegraph charge noise. For a typical spectrum of 1/f noise
we find that high fidelity, single-shot measurements are possible for signals q
> 0.01e. For the case of telegraph noise, we present a cross-correlation
measurement technique that uses two rf-SETs to suppress the effect of random
switching events on readout. We demonstrate this technique by monitoring the
charge state of a metal double dot system on microsecond time-scales. Such a
scheme will be advantageous in achieving high readout fidelity in a solid state
quantum computer.
