Intrinsic phonon decoherence and quantum gates in coupled lateral quantum dot charge qubits

Details Intrinsic phonon decoherence and quantum gates in coupled lateral quantum dot charge qubits Intrinsic phonon decoherence and quantum gates in coupled lateral quantum dot charge qubits

2005-07-07

arxiv.org/abs/cond-mat/0507178v2

Phys. Rev. B 72, 235321 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 7 figures

Scientific paper

10.1103/PhysRevB.72.235321

Recent experiments by Hayashi et al. [Phys. Rev. Lett. 91, 226804 (2003)] demonstrate coherent oscillations of a charge quantum bit (qubit) in laterally defined quantum dots. We study the intrinsic electron-phonon decoherence and gate performance for the next step: a system of two coupled charge qubits. The effective decoherence model contains properties of local as well as collective decoherence. Decoherence channels can be classified by their multipole moments, which leads to different low-energy spectra. It is shown that due to the super-Ohmic spectrum, the gate quality is limited by the single-qubit Hadamard gates. It can be significantly improved, by using double-dots with weak tunnel coupling.

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