Sensing dot with high output swing for scalable baseband readout of spin qubits
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arXiv
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| Autori principali: | , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2021
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| _version_ | 1866913499413741568 |
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| author | Kammerloher, Eugen Schmidbauer, Andreas Diebel, Laura Seidler, Inga Neul, Malte Künne, Matthias Ludwig, Arne Ritzmann, Julian Wieck, Andreas Bougeard, Dominique Schreiber, Lars R. Bluhm, Hendrik |
| author_facet | Kammerloher, Eugen Schmidbauer, Andreas Diebel, Laura Seidler, Inga Neul, Malte Künne, Matthias Ludwig, Arne Ritzmann, Julian Wieck, Andreas Bougeard, Dominique Schreiber, Lars R. Bluhm, Hendrik |
| contents | A crucial requirement for quantum computing, in particular for scalable quantum computing and error correction, is a fast and high-fidelity qubit readout. For semiconductor based qubits, one limiting factor for local low-power signal amplification, is the output swing of the charge sensor. We demonstrate GaAs and Si/SiGe asymmetric sensing dots (ASDs) specifically designed to provide a significantly improved response compared to conventional charge sensing dots. Our ASD design features a strongly decoupled drain reservoir from the sensor dot, which mitigates negative feedback effects found in conventional sensors. This results in a boosted output swing of $3\,\text{mV}$, which exceeds the response in the conventional regime of our device by more than ten times. The enhanced output signal paves the way for employing very low-power readout amplifiers in close proximity to the qubit. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2107_13598 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Sensing dot with high output swing for scalable baseband readout of spin qubits Kammerloher, Eugen Schmidbauer, Andreas Diebel, Laura Seidler, Inga Neul, Malte Künne, Matthias Ludwig, Arne Ritzmann, Julian Wieck, Andreas Bougeard, Dominique Schreiber, Lars R. Bluhm, Hendrik Mesoscale and Nanoscale Physics Quantum Physics A crucial requirement for quantum computing, in particular for scalable quantum computing and error correction, is a fast and high-fidelity qubit readout. For semiconductor based qubits, one limiting factor for local low-power signal amplification, is the output swing of the charge sensor. We demonstrate GaAs and Si/SiGe asymmetric sensing dots (ASDs) specifically designed to provide a significantly improved response compared to conventional charge sensing dots. Our ASD design features a strongly decoupled drain reservoir from the sensor dot, which mitigates negative feedback effects found in conventional sensors. This results in a boosted output swing of $3\,\text{mV}$, which exceeds the response in the conventional regime of our device by more than ten times. The enhanced output signal paves the way for employing very low-power readout amplifiers in close proximity to the qubit. |
| title | Sensing dot with high output swing for scalable baseband readout of spin qubits |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2107.13598 |