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Paper detail

Quantum-limited charge detection with two quantum point contacts

We present a scheme for tuning two quantum point contacts as a quantum-limited charge detector. Based on the scattering matrix approach, we analyze a general condition of quantum-limited detection with a single-channel quantum detector possessing time-reversal symmetry. From this analysis we find that quantum-limited detection can be easily realized with two quantum point contacts connected in series, which is not possible if only a single quantum point contact is used. We also discuss the sensitivity enhancement due to multiple reflections of the two point contacts.

preprint2011arXivOpen access
Kang-Ho LeeKicheon Kang
cond-mat.mes-hall
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Kang-Ho LeeKicheon Kang

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