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Master equation approach to the central spin decoherence problem: the uniform coupling model and the role of projection operators
Edwin Barnes, Łukasz Cywiński, S. Das Sarma
The generalized Master equation of the Nakajima-Zwanzig (NZ) type has been used extensively to investigate the coherence dynamics of the central spin model with the nuclear bath in…
Screening of charged impurities with multi-electron singlet-triplet spin qubits in quantum dots
Edwin Barnes, J. P. Kestner, N. T. T. Nguyen +1
Charged impurities in semiconductor quantum dots comprise one of the main obstacles to achieving scalable fabrication and manipulation of singlet-triplet spin qubits. We theoretica…
Electron-nuclear dynamics in a quantum dot under non-unitary electron control
Edwin Barnes, Sophia E. Economou
We introduce a method for solving the problem of an externally controlled electron spin in a quantum dot interacting with host nuclei via the hyperfine interaction. Our method acco…