Phonon-induced decoherence for a quantum dot spin qubit operated by Raman passage

Details Phonon-induced decoherence for a quantum dot spin qubit operated by Raman passage Phonon-induced decoherence for a quantum dot spin qubit operated by Raman passage

2004-04-27

arxiv.org/abs/cond-mat/0404647v2

Phys Rev B 71, 195333 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Final version; considerable extensions; 18 pages, 7 figures

Scientific paper

10.1103/PhysRevB.71.195333

We study single-qubit gates performed via stimulated Raman adiabatic passage (STIRAP) on a spin qubit implemented in a quantum dot system in the presence of phonons. We analyze the interplay of various kinds of errors resulting from the carrier-phonon interaction as well as from quantum jumps related to nonadiabaticity and calculate the fidelity as a function of the pulse parameters. We give quantitative estimates for an InAs/GaAs system and identify the parameter values for which the error is considerably minimized, even to values below $10^{-4}$ per operation.

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