High-fidelity spin qubit operation and algorithmic initialization above 1 K
The encoding of qubits in semiconductor spin carriers has been recognized as a promising approach to a commercial quantum computer that can be lithographically produced and integrated at scale. However, the operation of the large number of qubits required for advantageous quantum applications will p...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Jezik: | English |
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Springer Nature
2024
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| _version_ | 1826312898308210688 |
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| author | Huang, JY Su, RY Lim, WH Feng, M van Straaten, B Severin, B Gilbert, W Dumoulin Stuyck, N Tanttu, T Serrano, S Cifuentes, JD Hansen, I Seedhouse, AE Vahapoglu, E Leon, RCC Abrosimov, NV Pohl, H-J Thewalt, MLW Hudson, FE Escott, CC Ares, N Bartlett, SD Morello, A Saraiva, A Laucht, A Dzurak, AS Yang, CH |
| author_facet | Huang, JY Su, RY Lim, WH Feng, M van Straaten, B Severin, B Gilbert, W Dumoulin Stuyck, N Tanttu, T Serrano, S Cifuentes, JD Hansen, I Seedhouse, AE Vahapoglu, E Leon, RCC Abrosimov, NV Pohl, H-J Thewalt, MLW Hudson, FE Escott, CC Ares, N Bartlett, SD Morello, A Saraiva, A Laucht, A Dzurak, AS Yang, CH |
| author_sort | Huang, JY |
| collection | OXFORD |
| description | The encoding of qubits in semiconductor spin carriers has been recognized as a promising approach to a commercial quantum computer that can be lithographically produced and integrated at scale. However, the operation of the large number of qubits required for advantageous quantum applications will produce a thermal load exceeding the available cooling power of cryostats at millikelvin temperatures. As the scale-up accelerates, it becomes imperative to establish fault-tolerant operation above 1 K, at which the cooling power is orders of magnitude higher. Here we tune up and operate spin qubits in silicon above 1 K, with fidelities in the range required for fault-tolerant operations at these temperatures. We design an algorithmic initialization protocol to prepare a pure two-qubit state even when the thermal energy is substantially above the qubit energies and incorporate radiofrequency readout to achieve fidelities up to 99.34% for both readout and initialization. We also demonstrate single-qubit Clifford gate fidelities up to 99.85% and a two-qubit gate fidelity of 98.92%. These advances overcome the fundamental limitation that the thermal energy must be well below the qubit energies for the high-fidelity operation to be possible, surmounting a main obstacle in the pathway to scalable and fault-tolerant quantum computation. |
| first_indexed | 2024-09-25T04:02:23Z |
| format | Journal article |
| id | oxford-uuid:c7a2f49f-cb0e-4a0a-ad84-68cd0a5d74c7 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-09-25T04:02:23Z |
| publishDate | 2024 |
| publisher | Springer Nature |
| record_format | dspace |
| spelling | oxford-uuid:c7a2f49f-cb0e-4a0a-ad84-68cd0a5d74c72024-04-26T12:51:41ZHigh-fidelity spin qubit operation and algorithmic initialization above 1 KJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:c7a2f49f-cb0e-4a0a-ad84-68cd0a5d74c7EnglishSymplectic ElementsSpringer Nature2024Huang, JYSu, RYLim, WHFeng, Mvan Straaten, BSeverin, BGilbert, WDumoulin Stuyck, NTanttu, TSerrano, SCifuentes, JDHansen, ISeedhouse, AEVahapoglu, ELeon, RCCAbrosimov, NVPohl, H-JThewalt, MLWHudson, FEEscott, CCAres, NBartlett, SDMorello, ASaraiva, ALaucht, ADzurak, ASYang, CHThe encoding of qubits in semiconductor spin carriers has been recognized as a promising approach to a commercial quantum computer that can be lithographically produced and integrated at scale. However, the operation of the large number of qubits required for advantageous quantum applications will produce a thermal load exceeding the available cooling power of cryostats at millikelvin temperatures. As the scale-up accelerates, it becomes imperative to establish fault-tolerant operation above 1 K, at which the cooling power is orders of magnitude higher. Here we tune up and operate spin qubits in silicon above 1 K, with fidelities in the range required for fault-tolerant operations at these temperatures. We design an algorithmic initialization protocol to prepare a pure two-qubit state even when the thermal energy is substantially above the qubit energies and incorporate radiofrequency readout to achieve fidelities up to 99.34% for both readout and initialization. We also demonstrate single-qubit Clifford gate fidelities up to 99.85% and a two-qubit gate fidelity of 98.92%. These advances overcome the fundamental limitation that the thermal energy must be well below the qubit energies for the high-fidelity operation to be possible, surmounting a main obstacle in the pathway to scalable and fault-tolerant quantum computation. |
| spellingShingle | Huang, JY Su, RY Lim, WH Feng, M van Straaten, B Severin, B Gilbert, W Dumoulin Stuyck, N Tanttu, T Serrano, S Cifuentes, JD Hansen, I Seedhouse, AE Vahapoglu, E Leon, RCC Abrosimov, NV Pohl, H-J Thewalt, MLW Hudson, FE Escott, CC Ares, N Bartlett, SD Morello, A Saraiva, A Laucht, A Dzurak, AS Yang, CH High-fidelity spin qubit operation and algorithmic initialization above 1 K |
| title | High-fidelity spin qubit operation and algorithmic initialization above 1 K |
| title_full | High-fidelity spin qubit operation and algorithmic initialization above 1 K |
| title_fullStr | High-fidelity spin qubit operation and algorithmic initialization above 1 K |
| title_full_unstemmed | High-fidelity spin qubit operation and algorithmic initialization above 1 K |
| title_short | High-fidelity spin qubit operation and algorithmic initialization above 1 K |
| title_sort | high fidelity spin qubit operation and algorithmic initialization above 1 k |
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