Cryogenic, near-field quantum logic chips with passive field nulling on 43Ca+
<p>This work describes the design and implementation of a new apparatus to achieve quantum information processing in trapped ions using microwave methods. The apparatus involves many design improvements over a previous quantum processing experiment which achieved the highest single-qubit gate...
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
2019
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| _version_ | 1797099328280461312 |
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| author | Wolf, J |
| author2 | Steane, A |
| author_facet | Steane, A Wolf, J |
| author_sort | Wolf, J |
| collection | OXFORD |
| description | <p>This work describes the design and implementation of a new apparatus to achieve quantum information processing in trapped ions using microwave methods. The apparatus involves many design improvements over a previous quantum processing experiment which achieved the highest single-qubit gate fidelity, longest coherence time, and highest microwave based two-qubit fidelity.
The goal of this new experiment is a two-qubit gate speed and a fidelity improvement of a factor of 10, making microwave based gates much more feasible as quantum processors. To this end, a novel clock qubit within <sup>43</sup>Ca<sup>+</sup> is chosen, and the ion height is nearly halved. An anticipated heating rate increase is counteracted by the use of cryogenics. A novel ion chip design is implemented via wafer-scale fabrication and subsequently attached using a novel eutectic bonding technique. The implementation required many design and fabrication problems to be solved; these are described. The vacuum system reaches < 10<sup>−11</sup> mbar even at room temperature, lowering experimental difficulty and allowing for performance comparisons at a wide temperature range. A new experiment control system, ARTIQ, and corresponding Sinara hardware is used
for control. Experimental results achieved so far include a study of contributing factors to the ion loading rate, and a comparison between the designed and measured microwave fields. All results achieved to date are compatible with the main
speed and fidelity goal, which should be achieved in the near future.</p>
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| first_indexed | 2024-03-07T05:22:15Z |
| format | Thesis |
| id | oxford-uuid:df535734-dc43-487a-93de-b8789929104b |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:22:15Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | oxford-uuid:df535734-dc43-487a-93de-b8789929104b2022-03-27T09:38:35ZCryogenic, near-field quantum logic chips with passive field nulling on 43Ca+Thesishttp://purl.org/coar/resource_type/c_db06uuid:df535734-dc43-487a-93de-b8789929104bQuantum computingLasersAtomic physicsQuantum physicsPhysicsCryogenicsEnglishHyrax Deposit2019Wolf, JSteane, A<p>This work describes the design and implementation of a new apparatus to achieve quantum information processing in trapped ions using microwave methods. The apparatus involves many design improvements over a previous quantum processing experiment which achieved the highest single-qubit gate fidelity, longest coherence time, and highest microwave based two-qubit fidelity. The goal of this new experiment is a two-qubit gate speed and a fidelity improvement of a factor of 10, making microwave based gates much more feasible as quantum processors. To this end, a novel clock qubit within <sup>43</sup>Ca<sup>+</sup> is chosen, and the ion height is nearly halved. An anticipated heating rate increase is counteracted by the use of cryogenics. A novel ion chip design is implemented via wafer-scale fabrication and subsequently attached using a novel eutectic bonding technique. The implementation required many design and fabrication problems to be solved; these are described. The vacuum system reaches < 10<sup>−11</sup> mbar even at room temperature, lowering experimental difficulty and allowing for performance comparisons at a wide temperature range. A new experiment control system, ARTIQ, and corresponding Sinara hardware is used for control. Experimental results achieved so far include a study of contributing factors to the ion loading rate, and a comparison between the designed and measured microwave fields. All results achieved to date are compatible with the main speed and fidelity goal, which should be achieved in the near future.</p> |
| spellingShingle | Quantum computing Lasers Atomic physics Quantum physics Physics Cryogenics Wolf, J Cryogenic, near-field quantum logic chips with passive field nulling on 43Ca+ |
| title | Cryogenic, near-field quantum logic chips with passive field nulling on 43Ca+ |
| title_full | Cryogenic, near-field quantum logic chips with passive field nulling on 43Ca+ |
| title_fullStr | Cryogenic, near-field quantum logic chips with passive field nulling on 43Ca+ |
| title_full_unstemmed | Cryogenic, near-field quantum logic chips with passive field nulling on 43Ca+ |
| title_short | Cryogenic, near-field quantum logic chips with passive field nulling on 43Ca+ |
| title_sort | cryogenic near field quantum logic chips with passive field nulling on 43ca |
| topic | Quantum computing Lasers Atomic physics Quantum physics Physics Cryogenics |
| work_keys_str_mv | AT wolfj cryogenicnearfieldquantumlogicchipswithpassivefieldnullingon43ca |