Quantum control of hole spin qubits in double quantum dots

Fernández-Fernández, David; Ban, Y.; Platero, G.

doi:10.48550/arxiv.2204.07453

Cited by 2 publications

(2 citation statements)

References 62 publications

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“…Our theory helps to develop a fundamental understanding of ZFS, essential to account for its effect in quantum computing applications. For example, the exchange anisotropy associated with the ZFS could enable the encoding of hole singlet-triplet qubits [53][54][55][56] at zero magnetic filed, and when combined with a Zeeman field it can lift the Pauli spin blockade [57,58], with critical implications in readout protocols. Furthermore, ZFS can introduce systematic errors in 2-qubit gates based on isotropic interactions between tunnel-coupled QDs [1,33,59].…”

mentioning

confidence: 99%

Anomalous Zero-Field Splitting for Hole Spin Qubits in Si and Ge Quantum Dots

2022

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An anomalous energy splitting of spin triplet states at zero magnetic field has recently been measured in germanium quantum dots. This zero-field splitting could crucially alter the coupling between tunnelcoupled quantum dots, the basic building blocks of state-of-the-art spin-based quantum processors, with profound implications for semiconducting quantum computers. We develop an analytical model linking the zero-field splitting to the Rashba spin-orbit interaction that is cubic in momentum. Such interactions naturally emerge in hole nanostructures, where they can also be tuned by external electric fields, and we find them to be particularly large in silicon and germanium, resulting in a significant zero-field splitting in the μeV range. We confirm our analytical theory by numerical simulations of different quantum dots, also including other possible sources of zero-field splitting. Our findings are applicable to a broad range of current architectures encoding spin qubits and provide a deeper understanding of these materials, paving the way toward the next generation of semiconducting quantum processors.

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mentioning

confidence: 99%

Anomalous Zero-Field Splitting for Hole Spin Qubits in Si and Ge Quantum Dots

2022

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“…Our theory helps to develop a fundamental understanding of ZFS, essential to account for its effect in quantum computing applications. For example, the exchange anisotropy could enable the encoding of hole singlet-triplet qubits [50][51][52][53] at zero magnetic filed, and when combined with a Zeeman field, it can lift the Pauli spin-blockade, with critical implications in read-out protocols [54]. Furthermore, ZFS can introduce systematic errors in two-qubit gates based on isotropic interactions between tunnel-coupled QDs [1,31,55].…”

mentioning

confidence: 99%

Anomalous zero-field splitting for hole spin qubits in Si and Ge quantum dots

Hetényi,

Bosco,

Loss

2022

Preprint

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An anomalous energy splitting of spin triplet states at zero magnetic field has recently been measured in germanium quantum dots. This zero-field splitting could crucially alter the coupling between tunnel-coupled quantum dots, the basic building blocks of state-of-the-art spin-based quantum processors, with profound implications for semiconducting quantum computers. We develop an analytical model linking the zero-field splitting to spin-orbit interactions that are cubic in momentum. Such interactions naturally emerge in hole nanostructures, where they can also be tuned by external electric fields, and we find them to be particularly large in silicon and germanium, resulting in a significant zero-field splitting in the µeV range. We confirm our analytical theory by numerical simulations of different quantum dots, also including other possible sources of zero-field splitting. Our findings are applicable to a broad range of current architectures encoding spin qubits and provide a deeper understanding of these materials, paving the way towards the next generation of semiconducting quantum processors.

show abstract

Quantum control of hole spin qubits in double quantum dots

Cited by 2 publications

References 62 publications

Anomalous Zero-Field Splitting for Hole Spin Qubits in Si and Ge Quantum Dots

Anomalous Zero-Field Splitting for Hole Spin Qubits in Si and Ge Quantum Dots

Anomalous zero-field splitting for hole spin qubits in Si and Ge quantum dots

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