Charged-impurity-induced dephasing of a voltage-controlled coded qubit based on electron spin in a triple quantum dot | Zendy

I. Puerto Giménez | Zendy; ChangYu Hsieh | Zendy; Marek Korkusiński | Zendy; Paweł Hawrylak | Zendy

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Charged-impurity-induced dephasing of a voltage-controlled coded qubit based on electron spin in a triple quantum dot

Author(s) -

I. Puerto Giménez,

ChangYu Hsieh,

Marek Korkusiński,

Paweł Hawrylak

Publication year - 2009

Publication title -

physical review b

Language(s) - English

Resource type - Journals

eISSN - 1538-4489

pISSN - 1098-0121

DOI - 10.1103/physrevb.79.205311

Subject(s) - qubit , physics , dephasing , condensed matter physics , charge qubit , quantum dot , phase qubit , spin (aerodynamics) , coulomb , electron , exchange interaction , magnetic field , flux qubit , quantum mechanics , quantum , ferromagnetism , thermodynamics

We discuss the effect of a charged impurity on the qubit encoded in the two low-energy states of an electrostatically defined triple quantum dot with one-electron spin in each dot. The two qubit levels are identified with the two opposite directions of the motion of a minority spin. The effect of the charged impurity on the coded qubit is mapped onto the problem of an effective spin in a random magnetic field. The effective magnetic field is related to exchange rather than Coulomb interaction which ensures stability of the coded qubit with respect to charge fluctuations.Peer reviewed: YesNRC publication: Ye

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