Continuous quantum measurement: inelastic tunnelling suppresses current oscillations

Details Continuous quantum measurement: inelastic tunnelling suppresses current oscillations Continuous quantum measurement: inelastic tunnelling suppresses current oscillations

2003-07-30

arxiv.org/abs/cond-mat/0307727v2

Phys. Rev. Lett. 92, 136802 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, comments are welcome

Scientific paper

10.1103/PhysRevLett.92.136802

We study the dynamics of a charge qubit, consisting of a single electron in a double well potential coupled to a point-contact (PC) electrometer, using the quantum trajectories formalism. Contrary to previous predictions, we show formally that, in the sub-Zeno limit, coherent oscillations in the detector output are suppressed, and the dynamics is dominated by inelastic processes in the PC. Furthermore, these reduce the detector efficiency and induce relaxation even when the source-drain bias is zero. This is of practical significance since it means the detector will act as a source of decoherence. Finally, we show that the sub-Zeno dynamics is divided into two regimes: low- and high-bias in which the PC current power spectra show markedly different behaviour.

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