Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet qubits

Andrea Ballabio; Andrea Hofmann; Daniel Chrastina; Daniel Jirovec; Georgios Katsaros; Giovanni Isella; Ivan Prieto; Jacopo Frigerio; Maxim Borovkov

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Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet qubits

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arxiv 1910.05841 v1 pith:PUHDJ4JO submitted 2019-10-13 cond-mat.mes-hall

Andrea Hofmann , Daniel Jirovec , Maxim Borovkov , Ivan Prieto , Andrea Ballabio , Jacopo Frigerio , Daniel Chrastina , Giovanni Isella

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Georgios Katsaros

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keywords quantumdotsdoublesigesinglet-tripletqubitsadjacentanisotropy

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abstract

We study double quantum dots in a Ge/SiGe heterostructure and test their maturity towards singlet-triplet ($S-T_0$) qubits. We demonstrate a large range of tunability, from two single quantum dots to a double quantum dot. We measure Pauli spin blockade and study the anisotropy of the $g$-factor. We use an adjacent quantum dot for sensing charge transitions in the double quantum dot at interest. In conclusion, Ge/SiGe possesses all ingredients necessary for building a singlet-triplet qubit.

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