Single-Shot Readout with the Radio Frequency Single Electron Transistor in the Presence of Charge Noise

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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.
Updated and revised version (content including Figs updated). Comments very welcome: tilo@jupiter.phys.unsw.edu.au,djr@jupiter.phys.unsw.edu.au

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Mesoscale and Nanoscale Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/21240

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0304384
 http://arxiv.org/abs/cond-mat/0304384

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arXiv