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Collective Encoding of Quantum Information in a Quantum Dot Register

100%
Grodecka A., Machnikowski P.
Acta Physica Polonica A
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2006
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vol. 110
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issue 2
195-200
EN
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.
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Quantized Absorption Strength of Multi-Exciton Quantum Dots

81%
Wójcik K., Grodecka A., Wójs A.
Acta Physica Polonica A
|
2006
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vol. 110
|
issue 3
423-428
EN
Energy and absorption/recombination spectra of up to two electron-hole pairs confined in a spherical quantum dot are studied numerically as a function of dot radius (i.e., confinement volume). The transition between fermionic and bosonic behavior of the confined excitons is identified in coincidence with enhancement of low-energy absorption strength.
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