Phase readout of a charge qubit capacitively coupled to an open double quantum dot

Details Phase readout of a charge qubit capacitively coupled to an open double quantum dot Phase readout of a charge qubit capacitively coupled to an open double quantum dot

2009-04-17

arxiv.org/abs/0904.2754v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 4 figures

Scientific paper

10.1103/PhysRevB.81.125404

We study the dynamics of a charge qubit that is capacitively coupled to an open double quantum dot. Depending on the qubit state, the transport through the open quantum dot may be resonant or off-resonant, such that the qubit affects the current through the open double dot. We relate the initial qubit state to the magnitude of an emerging transient current peak. The relation between these quantities enables the readout of not only the charge but also the phase of the qubit.

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