Dephasing and error dynamics affecting a singlet-triplet qubit during coherent spin shuttling
Abstract Quantum information transport over micron to millimeter scale distances is critical for the operation of practical quantum processors based on spin qubits. One method of achieving a long-range interaction is by coherent electron spin shuttling through an array of silicon quantum dots. In or...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-04-01
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| Series: | npj Quantum Information |
| Online Access: | https://doi.org/10.1038/s41534-025-00996-0 |
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| author | Natalie D. Foster Jacob D. Henshaw Martin Rudolph Dwight R. Luhman Ryan M. Jock |
| author_facet | Natalie D. Foster Jacob D. Henshaw Martin Rudolph Dwight R. Luhman Ryan M. Jock |
| author_sort | Natalie D. Foster |
| collection | DOAJ |
| description | Abstract Quantum information transport over micron to millimeter scale distances is critical for the operation of practical quantum processors based on spin qubits. One method of achieving a long-range interaction is by coherent electron spin shuttling through an array of silicon quantum dots. In order to execute many shuttling operations with high fidelity, it is essential to understand the dynamics of qubit dephasing and relaxation during the shuttling process in order to mitigate them. However, errors arising after many repeated shuttles are not yet well documented. Here, we probe decay dynamics contributing to dephasing and relaxation of a singlet-triplet qubit during coherent spin shuttling over many N repeated shuttle operations, in a small external magnetic field B 0 ≈ 0−10 mT, and in the absence of a micromagnet. We find that losses are dominated by magnetic dephasing, most visible for small N < 103. However, incoherent spin-flip type shuttle errors become evident for large N > 103. Additionally, we estimate shuttle error rates below 10−4 out to at least N = 103, representing an encouraging figure for future implementations of spin shuttling to entangle distant qubits. |
| format | Article |
| id | doaj-art-ab631cef3f2c4baa9273fec735df3c4c |
| institution | DOAJ |
| issn | 2056-6387 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Information |
| spelling | doaj-art-ab631cef3f2c4baa9273fec735df3c4c2025-08-20T03:10:13ZengNature Portfolionpj Quantum Information2056-63872025-04-011111810.1038/s41534-025-00996-0Dephasing and error dynamics affecting a singlet-triplet qubit during coherent spin shuttlingNatalie D. Foster0Jacob D. Henshaw1Martin Rudolph2Dwight R. Luhman3Ryan M. Jock4Sandia National LaboratoriesSandia National LaboratoriesSandia National LaboratoriesSandia National LaboratoriesSandia National LaboratoriesAbstract Quantum information transport over micron to millimeter scale distances is critical for the operation of practical quantum processors based on spin qubits. One method of achieving a long-range interaction is by coherent electron spin shuttling through an array of silicon quantum dots. In order to execute many shuttling operations with high fidelity, it is essential to understand the dynamics of qubit dephasing and relaxation during the shuttling process in order to mitigate them. However, errors arising after many repeated shuttles are not yet well documented. Here, we probe decay dynamics contributing to dephasing and relaxation of a singlet-triplet qubit during coherent spin shuttling over many N repeated shuttle operations, in a small external magnetic field B 0 ≈ 0−10 mT, and in the absence of a micromagnet. We find that losses are dominated by magnetic dephasing, most visible for small N < 103. However, incoherent spin-flip type shuttle errors become evident for large N > 103. Additionally, we estimate shuttle error rates below 10−4 out to at least N = 103, representing an encouraging figure for future implementations of spin shuttling to entangle distant qubits.https://doi.org/10.1038/s41534-025-00996-0 |
| spellingShingle | Natalie D. Foster Jacob D. Henshaw Martin Rudolph Dwight R. Luhman Ryan M. Jock Dephasing and error dynamics affecting a singlet-triplet qubit during coherent spin shuttling npj Quantum Information |
| title | Dephasing and error dynamics affecting a singlet-triplet qubit during coherent spin shuttling |
| title_full | Dephasing and error dynamics affecting a singlet-triplet qubit during coherent spin shuttling |
| title_fullStr | Dephasing and error dynamics affecting a singlet-triplet qubit during coherent spin shuttling |
| title_full_unstemmed | Dephasing and error dynamics affecting a singlet-triplet qubit during coherent spin shuttling |
| title_short | Dephasing and error dynamics affecting a singlet-triplet qubit during coherent spin shuttling |
| title_sort | dephasing and error dynamics affecting a singlet triplet qubit during coherent spin shuttling |
| url | https://doi.org/10.1038/s41534-025-00996-0 |
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