Qubit measurements with a double-dot detector

Details Qubit measurements with a double-dot detector Qubit measurements with a double-dot detector

2006-06-14

arxiv.org/abs/cond-mat/0606376v2

Phys. Rev. Lett., 97, 116806 (2006).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, some explanations added, Phys. Rev. Lett., in press

Scientific paper

10.1103/PhysRevLett.97.116806

We propose to monitor a qubit with a double-dot (DD) resonant-tunneling detector, which can operate at higher temperatures than a single-dot detector. In order to assess the effectiveness of this device, we derive rate equations for the density matrix of the entire system. We show that the signal-to-noise ratio can be greatly improved by a proper choice of the parameters and location of the detector. We demonstrate that quantum interference effects within the DD detector play an important role in the measurement. Surprisingly, these effects produce a systematic measurement error, even when the entire system is in a stationary state.

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