High-fidelity two-qubit gates of hybrid superconducting-semiconducting singlet-triplet qubits
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866909106568167424 |
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| author | Spethmann, Maria Bosco, Stefano Hofmann, Andrea Klinovaja, Jelena Loss, Daniel |
| author_facet | Spethmann, Maria Bosco, Stefano Hofmann, Andrea Klinovaja, Jelena Loss, Daniel |
| contents | Hybrid systems comprising superconducting and semiconducting materials are promising architectures for quantum computing. Superconductors induce long-range interactions between the spin degrees of freedom of semiconducting quantum dots. These interactions are widely anisotropic when the semiconductor material has strong spin-orbit interactions. We show that this anisotropy is tunable and enables fast and high-fidelity two-qubit gates between singlet-triplet (ST) spin qubits. Our design is immune to leakage of the quantum information into noncomputational states and removes always-on interactions between the qubits, thus resolving key open challenges for these architectures. Our ST qubits do not require additional technologically demanding components nor fine-tuning of parameters. They operate at low magnetic fields of a few millitesla and are fully compatible with superconductors. By suppressing systematic errors in realistic devices, we estimate infidelities below $10^{-3}$, which could pave the way toward large-scale hybrid superconducting-semiconducting quantum processors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2304_05086 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | High-fidelity two-qubit gates of hybrid superconducting-semiconducting singlet-triplet qubits Spethmann, Maria Bosco, Stefano Hofmann, Andrea Klinovaja, Jelena Loss, Daniel Quantum Physics Mesoscale and Nanoscale Physics Superconductivity Hybrid systems comprising superconducting and semiconducting materials are promising architectures for quantum computing. Superconductors induce long-range interactions between the spin degrees of freedom of semiconducting quantum dots. These interactions are widely anisotropic when the semiconductor material has strong spin-orbit interactions. We show that this anisotropy is tunable and enables fast and high-fidelity two-qubit gates between singlet-triplet (ST) spin qubits. Our design is immune to leakage of the quantum information into noncomputational states and removes always-on interactions between the qubits, thus resolving key open challenges for these architectures. Our ST qubits do not require additional technologically demanding components nor fine-tuning of parameters. They operate at low magnetic fields of a few millitesla and are fully compatible with superconductors. By suppressing systematic errors in realistic devices, we estimate infidelities below $10^{-3}$, which could pave the way toward large-scale hybrid superconducting-semiconducting quantum processors. |
| title | High-fidelity two-qubit gates of hybrid superconducting-semiconducting singlet-triplet qubits |
| topic | Quantum Physics Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2304.05086 |