Fast readout of quantum dot spin qubits via Andreev spins
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866912447358566400 |
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| author | Jakob, Michèle Laubscher, Katharina Del Vecchio, Patrick Chatterjee, Anasua Fatemi, Valla Bosco, Stefano |
| author_facet | Jakob, Michèle Laubscher, Katharina Del Vecchio, Patrick Chatterjee, Anasua Fatemi, Valla Bosco, Stefano |
| contents | Spin qubits in semiconducting quantum dots are currently limited by slow readout processes, which are orders of magnitude slower than gate operations. In contrast, Andreev spin qubits benefit from fast measurement schemes enabled by the large resonator couplings of superconducting qubits but suffer from reduced coherence during qubit operations. Here, we propose fast and high-fidelity measurement protocols based on an electrically-tunable coupling between quantum dot and Andreev spin qubits. In realistic devices, this coupling can be made sufficiently strong to enable high-fidelity readout well below microseconds, potentially enabling mid-circuit measurements. Crucially, the electrical tunability of our coupler permits to switch it off during idle periods, minimizing crosstalk and measurement back-action. Our approach is fully compatible with germanium-based devices and paves the way for scalable quantum computing architectures by leveraging the advantages of heterogeneous qubit implementations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_19762 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Fast readout of quantum dot spin qubits via Andreev spins Jakob, Michèle Laubscher, Katharina Del Vecchio, Patrick Chatterjee, Anasua Fatemi, Valla Bosco, Stefano Mesoscale and Nanoscale Physics Quantum Physics Spin qubits in semiconducting quantum dots are currently limited by slow readout processes, which are orders of magnitude slower than gate operations. In contrast, Andreev spin qubits benefit from fast measurement schemes enabled by the large resonator couplings of superconducting qubits but suffer from reduced coherence during qubit operations. Here, we propose fast and high-fidelity measurement protocols based on an electrically-tunable coupling between quantum dot and Andreev spin qubits. In realistic devices, this coupling can be made sufficiently strong to enable high-fidelity readout well below microseconds, potentially enabling mid-circuit measurements. Crucially, the electrical tunability of our coupler permits to switch it off during idle periods, minimizing crosstalk and measurement back-action. Our approach is fully compatible with germanium-based devices and paves the way for scalable quantum computing architectures by leveraging the advantages of heterogeneous qubit implementations. |
| title | Fast readout of quantum dot spin qubits via Andreev spins |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2506.19762 |