Research paperTheoreticalComputational Kinetic ModelDecoherence of electron spin qubit during transfer between two semiconductor quantum dots at low magnetic fieldsJan A. Krzywda, Łukasz CywińskiarXiv·2024·10.1103/PhysRevB.111.115305·arXiv:2405.12185AbstractElectron shuttling is one of the current avenues being pursued to scale semiconductor quantum dot-based spin qubits. In this paper, we theoretically analyze the dephasing of a spin qubit adiabatically transferred between two tunnel-coupled quantum dots, focusing on the low-magnetic-field regime where the Zeeman splitting is smaller than the tunnel coupling. We study coherent transfer errors arising from Landau-Zener charge transfer, charge noise, phonon-assisted processes, spin relaxation enhanced by spin-orbit mixing, and spin dephasing due to fluctuations in detuning and Zeeman splittings. The results are compared for Si- and GaAs-based quantum dots, and a design guideline for silicon is given for coherent transfer across long dot arrays.Read more
Simulated Si-based double quantum dot spin-qubit transfer system in the low-magnetic-field regime.1 propertySiStudied MaterialExpand
Simulated GaAs-based double quantum dot spin-qubit transfer system in the low-magnetic-field regime.1 propertyGaAsStudied MaterialExpand
Research paperTheoreticalComputational Kinetic ModelDecoherence of electron spin qubit during transfer between two semiconductor quantum dots at low magnetic fieldsJan A. Krzywda, Łukasz CywińskiarXiv·2024·10.1103/PhysRevB.111.115305·arXiv:2405.12185AbstractElectron shuttling is one of the current avenues being pursued to scale semiconductor quantum dot-based spin qubits. In this paper, we theoretically analyze the dephasing of a spin qubit adiabatically transferred between two tunnel-coupled quantum dots, focusing on the low-magnetic-field regime where the Zeeman splitting is smaller than the tunnel coupling. We study coherent transfer errors arising from Landau-Zener charge transfer, charge noise, phonon-assisted processes, spin relaxation enhanced by spin-orbit mixing, and spin dephasing due to fluctuations in detuning and Zeeman splittings. The results are compared for Si- and GaAs-based quantum dots, and a design guideline for silicon is given for coherent transfer across long dot arrays.Read more
Simulated Si-based double quantum dot spin-qubit transfer system in the low-magnetic-field regime.1 propertySiStudied MaterialExpand
Simulated GaAs-based double quantum dot spin-qubit transfer system in the low-magnetic-field regime.1 propertyGaAsStudied MaterialExpand
Research paperTheoreticalComputational Kinetic ModelDecoherence of electron spin qubit during transfer between two semiconductor quantum dots at low magnetic fieldsJan A. Krzywda, Łukasz CywińskiarXiv·2024·10.1103/PhysRevB.111.115305·arXiv:2405.12185AbstractElectron shuttling is one of the current avenues being pursued to scale semiconductor quantum dot-based spin qubits. In this paper, we theoretically analyze the dephasing of a spin qubit adiabatically transferred between two tunnel-coupled quantum dots, focusing on the low-magnetic-field regime where the Zeeman splitting is smaller than the tunnel coupling. We study coherent transfer errors arising from Landau-Zener charge transfer, charge noise, phonon-assisted processes, spin relaxation enhanced by spin-orbit mixing, and spin dephasing due to fluctuations in detuning and Zeeman splittings. The results are compared for Si- and GaAs-based quantum dots, and a design guideline for silicon is given for coherent transfer across long dot arrays.Read more
Simulated Si-based double quantum dot spin-qubit transfer system in the low-magnetic-field regime.1 propertySiStudied MaterialExpand
Simulated GaAs-based double quantum dot spin-qubit transfer system in the low-magnetic-field regime.1 propertyGaAsStudied MaterialExpand
Research paperTheoreticalComputational Kinetic ModelDecoherence of electron spin qubit during transfer between two semiconductor quantum dots at low magnetic fieldsJan A. Krzywda, Łukasz CywińskiarXiv·2024·10.1103/PhysRevB.111.115305·arXiv:2405.12185AbstractElectron shuttling is one of the current avenues being pursued to scale semiconductor quantum dot-based spin qubits. In this paper, we theoretically analyze the dephasing of a spin qubit adiabatically transferred between two tunnel-coupled quantum dots, focusing on the low-magnetic-field regime where the Zeeman splitting is smaller than the tunnel coupling. We study coherent transfer errors arising from Landau-Zener charge transfer, charge noise, phonon-assisted processes, spin relaxation enhanced by spin-orbit mixing, and spin dephasing due to fluctuations in detuning and Zeeman splittings. The results are compared for Si- and GaAs-based quantum dots, and a design guideline for silicon is given for coherent transfer across long dot arrays.Read more
Simulated Si-based double quantum dot spin-qubit transfer system in the low-magnetic-field regime.1 propertySiStudied MaterialExpand
Simulated GaAs-based double quantum dot spin-qubit transfer system in the low-magnetic-field regime.1 propertyGaAsStudied MaterialExpand
