Collective Encoding of Quantum Information in a Quantum Dot Register
A. Grodecka and P. Machnikowski
Institute of Physics, Wrocław University of Technology, Wyb. Wyspiańskiego 27, 50-370 Wrocław, Poland
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Received: 17 06 2006;
We define the collective logical quantum bit as a state on an array of 2, 4, and 8 quantum dots. We show that such an array can be controlled with less phonon-induced pure dephasing than a single dot. We calculate the dephasing accompanying a single-qubit operation on the collective logical qubit by means of perturbative method describing the open system evolution under arbitrary driving.
DOI: 10.12693/APhysPolA.110.195
PACS numbers: 78.67.Hc, 63.20.Kr, 03.67.Pp