Decoherence of a charge qubit embedded inside a suspended phonon cavity

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Y. Y. Liao,¹ Y. N. Chen,² W. C. Chou,¹ and D. S. Chuu¹
¹Department of Electrophysics, National Chiao-Tung University, Hsinchu 300, Taiwan
²Department of Physics and National Center for Theoretical Sciences, National Cheng-Kung University, Tainan 701, Taiwan

Received 11 July 2007; published 14 January 2008

Thisstudy elucidates the theory of phonon-induced decoherence of a doubledot charge qubit that is embedded inside a suspended semiconductorslab. The influences of the lattice temperature, width of theslab, and positions of the dots on the decoherence areanalyzed. Numerical results indicate that the decoherence in the slabsystem is weaker than that in a bulk environment. Inparticular, the decoherence is markedly suppressed by the inhibition ofthe electron-phonon coupling. Such a system with low decoherence maybe useful for manipulating the qubits.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.77.033303
DOI:	10.1103/PhysRevB.77.033303
PACS:	73.21.La; 63.20.K-; 03.65.Yz; 62.25.-g 73.21.La Quantum dots (electron states/collective excitations) 63.20.K- Phonon interactions 03.65.Yz Decoherence; open systems; quantum statistical methods 62.25.-g Mechanical properties of nanoscale systems YEAR: 2008
KEYWORDS:	electron-phonon interactions, quantum computing, quantum dots, semiconductor materials

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