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Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 39: Materials and devices for quantum technology II

HL 39.6: Talk

Wednesday, March 18, 2020, 11:30–11:45, POT 112

Spin shuttling in a silicon double quantum dot — •Florian Ginzel1, Adam R. Mills2, Jason R. Petta2, and Guido Burkard11Department of Physics, University of Konstanz, D-78457 Konstanz, Germany — 2Department of Physics, Princeton University, Princeton, New Jersey 08544, USA

Motivated by the demand[1] for long and intermediate range interaction in quantum information devices and recent developments[2,3] we theoretically analyze the dynamics of an electron during a detuning sweep in a silicon double quantum dot (DQD) occupied by one electron, and investigate possibilities and limitations of spin transport. Spin-orbit interaction and an inhomogeneous magnetic field which can introduce errors 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 outcome of a spin shuttling protocol is explored by means of numerical simulations and an approximate analytical model based on the solution to the Landau-Zener problem. We find that constructive interference can ensure a high transport fidelity even for a fast protocol. Exploiting destructive interference between different paths the DQD can also act as a spin or valley filter.

This work was supported by the ARO grant W911NF-15-1-0149.

[1] J. M. Taylor et al., Nat. Physics 1, 177 (2005)

[2] T. Fujita et al., npj Quan. Inf. 3, 22 (2017)

[3] A. R. Mills et al., Nat. Communs. 10, 1063 (2019)

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