Exchange anisotropies in microwave-driven singlet-triplet qubits
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866912131447783424 |
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| author | Saez-Mollejo, Jaime Jirovec, Daniel Schell, Yona Kukucka, Josip Calcaterra, Stefano Chrastina, Daniel Isella, Giovanni Rimbach-Russ, Maximilian Bosco, Stefano Katsaros, Georgios |
| author_facet | Saez-Mollejo, Jaime Jirovec, Daniel Schell, Yona Kukucka, Josip Calcaterra, Stefano Chrastina, Daniel Isella, Giovanni Rimbach-Russ, Maximilian Bosco, Stefano Katsaros, Georgios |
| contents | Hole spin qubits are rapidly emerging as the workhorse of semiconducting quantum processors because of their large spin-orbit interaction, enabling fast all-electric operations at low power. However, spin-orbit interaction also causes non-uniformities in devices, resulting in locally varying qubit energies and site-dependent anisotropies. While these anisotropies can be used to drive single-spins, if not properly harnessed, they can hinder the path toward large-scale quantum processors. Here, we report on microwave-driven singlet-triplet qubits in planar germanium and use them to investigate the anisotropy of two spins in a double quantum dot. We show two distinct operating regimes depending on the magnetic field direction. For in-plane fields, the two spins are largely anisotropic, and electrically tunable, which enables to measure all the available transitions; coherence times exceeding 3 $μ$s are extracted. For out-of-plane fields, they have an isotropic response but preserve the substantial energy difference required to address the singlet-triplet qubit. Even in this field direction, where the qubit lifetime is strongly affected by nuclear spins, we find 400 ns coherence times. Our work adds a valuable tool to investigate and harness the anisotropy of spin qubits and can be implemented in any large-scale NxN device, facilitating the path towards scalable quantum processors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_03224 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Exchange anisotropies in microwave-driven singlet-triplet qubits Saez-Mollejo, Jaime Jirovec, Daniel Schell, Yona Kukucka, Josip Calcaterra, Stefano Chrastina, Daniel Isella, Giovanni Rimbach-Russ, Maximilian Bosco, Stefano Katsaros, Georgios Mesoscale and Nanoscale Physics Quantum Physics Hole spin qubits are rapidly emerging as the workhorse of semiconducting quantum processors because of their large spin-orbit interaction, enabling fast all-electric operations at low power. However, spin-orbit interaction also causes non-uniformities in devices, resulting in locally varying qubit energies and site-dependent anisotropies. While these anisotropies can be used to drive single-spins, if not properly harnessed, they can hinder the path toward large-scale quantum processors. Here, we report on microwave-driven singlet-triplet qubits in planar germanium and use them to investigate the anisotropy of two spins in a double quantum dot. We show two distinct operating regimes depending on the magnetic field direction. For in-plane fields, the two spins are largely anisotropic, and electrically tunable, which enables to measure all the available transitions; coherence times exceeding 3 $μ$s are extracted. For out-of-plane fields, they have an isotropic response but preserve the substantial energy difference required to address the singlet-triplet qubit. Even in this field direction, where the qubit lifetime is strongly affected by nuclear spins, we find 400 ns coherence times. Our work adds a valuable tool to investigate and harness the anisotropy of spin qubits and can be implemented in any large-scale NxN device, facilitating the path towards scalable quantum processors. |
| title | Exchange anisotropies in microwave-driven singlet-triplet qubits |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2408.03224 |