Operating Semiconductor Qubits without Individual Barrier Gates
Semiconductor spin qubits have emerged as a promising platform for quantum computing, following a significant improvement in their control fidelities over recent years. Increasing the qubit count remains challenging, beginning with the fabrication of small features and complex fan-outs. A particular...
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| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2025-08-01
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| Series: | Physical Review X |
| Online Access: | http://doi.org/10.1103/xhq3-4jxz |
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| author | Alexander S. Ivlev Damien R. Crielaard Marcel Meyer William I. L. Lawrie Nico W. Hendrickx Amir Sammak Yuta Matsumoto Lieven M. K. Vandersypen Giordano Scappucci Corentin Déprez Menno Veldhorst |
| author_facet | Alexander S. Ivlev Damien R. Crielaard Marcel Meyer William I. L. Lawrie Nico W. Hendrickx Amir Sammak Yuta Matsumoto Lieven M. K. Vandersypen Giordano Scappucci Corentin Déprez Menno Veldhorst |
| author_sort | Alexander S. Ivlev |
| collection | DOAJ |
| description | Semiconductor spin qubits have emerged as a promising platform for quantum computing, following a significant improvement in their control fidelities over recent years. Increasing the qubit count remains challenging, beginning with the fabrication of small features and complex fan-outs. A particular challenge has been formed by the need for individual barrier gates to control the exchange interaction between adjacent spin qubits. Here, we propose a method to vary two-qubit interactions without applying pulses on individual barrier gates while also remaining insensitive to detuning noise in first order. Experimentally we find that changing plunger gate voltages over 300 mV can tune the exchange energy J from 100 kHz to 60 MHz. This allows us to perform two-qubit operations without changing the barrier gate voltage. Based on these findings we conceptualize a spin qubit architecture without individual barrier gates, simplifying the fabrication while maintaining the control necessary for universal quantum computation. |
| format | Article |
| id | doaj-art-af5e62f8a91e4be6831051cf0032fc16 |
| institution | Kabale University |
| issn | 2160-3308 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review X |
| spelling | doaj-art-af5e62f8a91e4be6831051cf0032fc162025-08-20T04:01:02ZengAmerican Physical SocietyPhysical Review X2160-33082025-08-0115303104210.1103/xhq3-4jxzOperating Semiconductor Qubits without Individual Barrier GatesAlexander S. IvlevDamien R. CrielaardMarcel MeyerWilliam I. L. LawrieNico W. HendrickxAmir SammakYuta MatsumotoLieven M. K. VandersypenGiordano ScappucciCorentin DéprezMenno VeldhorstSemiconductor spin qubits have emerged as a promising platform for quantum computing, following a significant improvement in their control fidelities over recent years. Increasing the qubit count remains challenging, beginning with the fabrication of small features and complex fan-outs. A particular challenge has been formed by the need for individual barrier gates to control the exchange interaction between adjacent spin qubits. Here, we propose a method to vary two-qubit interactions without applying pulses on individual barrier gates while also remaining insensitive to detuning noise in first order. Experimentally we find that changing plunger gate voltages over 300 mV can tune the exchange energy J from 100 kHz to 60 MHz. This allows us to perform two-qubit operations without changing the barrier gate voltage. Based on these findings we conceptualize a spin qubit architecture without individual barrier gates, simplifying the fabrication while maintaining the control necessary for universal quantum computation.http://doi.org/10.1103/xhq3-4jxz |
| spellingShingle | Alexander S. Ivlev Damien R. Crielaard Marcel Meyer William I. L. Lawrie Nico W. Hendrickx Amir Sammak Yuta Matsumoto Lieven M. K. Vandersypen Giordano Scappucci Corentin Déprez Menno Veldhorst Operating Semiconductor Qubits without Individual Barrier Gates Physical Review X |
| title | Operating Semiconductor Qubits without Individual Barrier Gates |
| title_full | Operating Semiconductor Qubits without Individual Barrier Gates |
| title_fullStr | Operating Semiconductor Qubits without Individual Barrier Gates |
| title_full_unstemmed | Operating Semiconductor Qubits without Individual Barrier Gates |
| title_short | Operating Semiconductor Qubits without Individual Barrier Gates |
| title_sort | operating semiconductor qubits without individual barrier gates |
| url | http://doi.org/10.1103/xhq3-4jxz |
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