Readout of a single electron spin in a double quantum dot using a quantum point contact - Condensed Matter > Mesoscale and Nanoscale PhysicsReport as inadecuate




Readout of a single electron spin in a double quantum dot using a quantum point contact - Condensed Matter > Mesoscale and Nanoscale Physics - Download this document for free, or read online. Document in PDF available to download.

Abstract: We study the dynamics of a single electron spin in a double quantum dot DQDand its readout via a quantum point contact QPC. We model the systemmicroscopically and derive rate equations for the reduced electron densitymatrix 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, theelectron spin states are distinctly characterized by a constant and anoscillatory current through the QPC. In the two-electron case, the readout ofthe spin state of the electron in one of the dots called the qubit dot isessentially similar after considering hyperfine interactions between theelectrons and the nuclear spins of the host materials and a uniform magneticfield applied to the DQD. Moreover, to ensure that an electron is properlyinjected into the qubit dot, we propose to determine the success of theelectron injection from the variations of the QPC current after applying anoscillating magnetic field to the qubit dot.



Author: Jian-Ping Zhang, Shi-Hua Ouyang, Chi-Hang Lam, J. Q. You

Source: https://arxiv.org/







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