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Author Zhang, Jian-Ping ♦ Ouyang, Shi-Hua ♦ Lam, Chi-Hang ♦ You, J. Q.
Source arXiv.org
Content type Text
File Format PDF
Date of Submission 2008-09-04
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Physics
Subject Keyword Condensed Matter - Mesoscale and Nanoscale Physics ♦ Quantum Physics ♦ physics:cond-mat ♦ physics:quant-ph
Abstract We study the dynamics of a single electron spin in a double quantum dot (DQD) and its readout via a quantum point contact (QPC). We model the system microscopically and derive rate equations for the reduced electron density matrix of the DQD. Two cases with one and two electrons in the DQD are studied. In the one-electron case, with different Zeeman splittings in the two dots, the electron spin states are distinctly characterized by a constant and an oscillatory current through the QPC. In the two-electron case, the readout of the spin state of the electron in one of the dots called the qubit dot is essentially similar after considering hyperfine interactions between the electrons and the nuclear spins of the host materials and a uniform magnetic field applied to the DQD. Moreover, to ensure that an electron is properly injected into the qubit dot, we propose to determine the success of the electron injection from the variations of the QPC current after applying an oscillating magnetic field to the qubit dot.
Description Reference: J. Phys.: Condens. Matter 20, 395206 (2008)
Educational Use Research
Learning Resource Type Article
Page Count 18


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