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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,10.1103/PhysRevB.72.235321,Physical Review B,Markus J. Sto

Intrinsic phonon decoherence and quantum gates in coupled lateral quantum-dot charge qubits   (Citations: 3)
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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.
Journal: Physical Review B - PHYS REV B , vol. 72, no. 23, 2005
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    • ...Decoherence induced by phonons in quantum dot systems allows to directly identify the phonons as the bath oscillators (Brandes and Kramer, 1999; Storcz et al., 2005a), whereas in the case of electric noise from resistors or cotunneling in dots (Hartmann and Wilhelm, 2004) it is less obvious—the Bosons are electron–hole excitations, which turn out to have the commutation relation of hard-core Bosons (von Delft and Schoeller, 1998) with the ...
    • ...partially correlated model (Storcz et al., 2005a), can be identified in the context of quantum dots...

    F. K. Wilhelmet al. Superconducting Qubits II: Decoherence

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