Spin shuttling in a silicon double quantum dot

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GINZEL, Florian, Adam R. MILLS, Jason R. PETTA, Guido BURKARD, 2020. Spin shuttling in a silicon double quantum dot. In: Physical Review B. American Physical Society (APS). 102(19), 195418. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.102.195418

@article{Ginzel2020-07-07T16:33:06Zshutt-51917, title={Spin shuttling in a silicon double quantum dot}, year={2020}, doi={10.1103/PhysRevB.102.195418}, number={19}, volume={102}, issn={2469-9950}, journal={Physical Review B}, author={Ginzel, Florian and Mills, Adam R. and Petta, Jason R. and Burkard, Guido}, note={Article Number: 195418} }

Mills, Adam R. Spin shuttling in a silicon double quantum dot 2020-11-25T12:52:23Z The transport of quantum information between different nodes of a quantum device is among the challenging functionalities of a quantum processor. In the context of spin qubits, this requirement can be met by coherent electron spin shuttling between semiconductor quantum dots. Here we theoretically study a minimal version of spin shuttling between two quantum dots. To this end, we analyze the dynamics of an electron during a detuning sweep in a silicon double quantum dot (DQD) occupied by one electron. Possibilities and limitations of spin transport are investigated. Spin-orbit interaction and the Zeeman effect in an inhomogeneous magnetic field play an important role for spin shuttling and are included in our model. Interactions that couple the position, spin, and valley degrees of freedom open a number of avoided crossings in the spectrum allowing for diabatic transitions and interfering paths. The outcomes of single and repeated spin shuttling protocols are explored by means of numerical simulations and an approximate analytical model based on the solution of the Landau-Zener problem. We find that a spin infidelity as low as 1−F<sub>s</sub>≲0.002 with a relatively fast level velocity of α=600μeVns<sup>−1</sup> is feasible for optimal choices of parameters or by making use of constructive interference. Ginzel, Florian Burkard, Guido 2020-07-07T16:33:06Z Ginzel, Florian Petta, Jason R. Burkard, Guido Mills, Adam R. 2020-11-25T12:52:23Z Petta, Jason R. eng

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