A dressed singlet-triplet qubit in germanium
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| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912956460040192 |
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| author | Tsoukalas, Konstantinos von Lüpke, Uwe Orekhov, Alexei Hetényi, Bence Seidler, Inga Sommer, Lisa Kelly, Eoin G. Massai, Leonardo Aldeghi, Michele Pita-Vidal, Marta Hendrickx, Nico W. Bedell, Stephen W. Paredes, Stephan Schupp, Felix J. Mergenthaler, Matthias Salis, Gian Fuhrer, Andreas Harvey-Collard, Patrick |
| author_facet | Tsoukalas, Konstantinos von Lüpke, Uwe Orekhov, Alexei Hetényi, Bence Seidler, Inga Sommer, Lisa Kelly, Eoin G. Massai, Leonardo Aldeghi, Michele Pita-Vidal, Marta Hendrickx, Nico W. Bedell, Stephen W. Paredes, Stephan Schupp, Felix J. Mergenthaler, Matthias Salis, Gian Fuhrer, Andreas Harvey-Collard, Patrick |
| contents | In semiconductor hole spin qubits, low magnetic field ($B$) operation extends the coherence time ($T_\mathrm{2}^*$) but proportionally reduces the gate speed. In contrast, singlet-triplet (ST) qubits are primarily controlled by the exchange interaction ($J$) and can thus maintain high gate speeds even at low $B$. However, a large $J$ introduces a significant charge component to the qubit, rendering ST qubits more vulnerable to charge noise when driven. Here, we demonstrate a highly coherent ST hole spin qubit in germanium, operating at both low $B$ and low $J$. By modulating $J$, we achieve resonant driving of the ST qubit, obtaining an average gate fidelity of $99.68\%$ and a coherence time of $T_\mathrm{2}^*=1.9\,μ$s. Moreover, by applying the resonant drive continuously, we realize a dressed ST qubit with a tenfold increase in coherence time ($T_\mathrm{2ρ}^*=20.3\,μ$s). Frequency modulation of the driving signal enables universal control, with an average gate fidelity of $99.63\%$. Our results demonstrate the potential for extending coherence times while preserving high-fidelity control of germanium-based ST qubits, paving the way for more efficient operations in semiconductor-based quantum processors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_14627 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A dressed singlet-triplet qubit in germanium Tsoukalas, Konstantinos von Lüpke, Uwe Orekhov, Alexei Hetényi, Bence Seidler, Inga Sommer, Lisa Kelly, Eoin G. Massai, Leonardo Aldeghi, Michele Pita-Vidal, Marta Hendrickx, Nico W. Bedell, Stephen W. Paredes, Stephan Schupp, Felix J. Mergenthaler, Matthias Salis, Gian Fuhrer, Andreas Harvey-Collard, Patrick Mesoscale and Nanoscale Physics Quantum Physics In semiconductor hole spin qubits, low magnetic field ($B$) operation extends the coherence time ($T_\mathrm{2}^*$) but proportionally reduces the gate speed. In contrast, singlet-triplet (ST) qubits are primarily controlled by the exchange interaction ($J$) and can thus maintain high gate speeds even at low $B$. However, a large $J$ introduces a significant charge component to the qubit, rendering ST qubits more vulnerable to charge noise when driven. Here, we demonstrate a highly coherent ST hole spin qubit in germanium, operating at both low $B$ and low $J$. By modulating $J$, we achieve resonant driving of the ST qubit, obtaining an average gate fidelity of $99.68\%$ and a coherence time of $T_\mathrm{2}^*=1.9\,μ$s. Moreover, by applying the resonant drive continuously, we realize a dressed ST qubit with a tenfold increase in coherence time ($T_\mathrm{2ρ}^*=20.3\,μ$s). Frequency modulation of the driving signal enables universal control, with an average gate fidelity of $99.63\%$. Our results demonstrate the potential for extending coherence times while preserving high-fidelity control of germanium-based ST qubits, paving the way for more efficient operations in semiconductor-based quantum processors. |
| title | A dressed singlet-triplet qubit in germanium |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2501.14627 |