Simple theory of the measured current through quantum dots

Details Simple theory of the measured current through quantum dots Simple theory of the measured current through quantum dots

2007-07-17

arxiv.org/abs/0707.2535v1

Phys.Rev. B77 (2008) 073311-(4)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

A simple theory of the detected current I(t) flowing through charge qubits -- quantum dots -- is proposed in terms of standard continuous measurement theory. Applied to a double dot, our formalism easily confirms previous results on quantum Zeno effect, driven by growing ammeter performance gamma. Due to the transparent formalism, we can calculate the exact fluctuation spectrum S(omega) of the detected current, containing a significant Lorentzian peak near the Rabi frequency of the double dot.

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