Multi-qubit gates in arrays coupled by 'always-on' interactions
Recently, there has been interest in the idea of quantum computing <em>without</em> control of the physical interactions between component qubits. This is highly appealing since the 'switching' of such interactions is a principal difficulty in creating real devices. It has been...
| Main Author: | |
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| Format: | Journal article |
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IOP Publishing
2004
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| _version_ | 1797089264264019968 |
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| author | Benjamin, S |
| author_facet | Benjamin, S |
| author_sort | Benjamin, S |
| collection | OXFORD |
| description | Recently, there has been interest in the idea of quantum computing <em>without</em> control of the physical interactions between component qubits. This is highly appealing since the 'switching' of such interactions is a principal difficulty in creating real devices. It has been established that one can employ 'always-on' interactions in a one-dimensional Heisenberg chain, provided that one can tune the Zeeman energies of the individual (pseudo-)spins. It is important to generalize this scheme to higher-dimensional networks, since a real device would probably be of that kind. Such generalizations have been proposed, but only at the severe cost that the efficiency of qubit storage must <em>fall</em>. Here we propose the use of multi-qubit gates within such higher-dimensional arrays, finding a novel three-qubit gate that can in fact increase the efficiency <em>beyond</em> the linear model. Thus, we are able to propose higher-dimensional networks that can constitute a better embodiment of the 'always-on' concept—a substantial step towards bringing this novel idea to full fruition. |
| first_indexed | 2024-03-07T03:01:52Z |
| format | Journal article |
| id | oxford-uuid:b13a2da4-0fd7-4f8d-87d4-e2370a9eec4a |
| institution | University of Oxford |
| last_indexed | 2024-03-07T03:01:52Z |
| publishDate | 2004 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | oxford-uuid:b13a2da4-0fd7-4f8d-87d4-e2370a9eec4a2022-03-27T04:02:25ZMulti-qubit gates in arrays coupled by 'always-on' interactionsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b13a2da4-0fd7-4f8d-87d4-e2370a9eec4aSymplectic Elements at OxfordIOP Publishing2004Benjamin, SRecently, there has been interest in the idea of quantum computing <em>without</em> control of the physical interactions between component qubits. This is highly appealing since the 'switching' of such interactions is a principal difficulty in creating real devices. It has been established that one can employ 'always-on' interactions in a one-dimensional Heisenberg chain, provided that one can tune the Zeeman energies of the individual (pseudo-)spins. It is important to generalize this scheme to higher-dimensional networks, since a real device would probably be of that kind. Such generalizations have been proposed, but only at the severe cost that the efficiency of qubit storage must <em>fall</em>. Here we propose the use of multi-qubit gates within such higher-dimensional arrays, finding a novel three-qubit gate that can in fact increase the efficiency <em>beyond</em> the linear model. Thus, we are able to propose higher-dimensional networks that can constitute a better embodiment of the 'always-on' concept—a substantial step towards bringing this novel idea to full fruition. |
| spellingShingle | Benjamin, S Multi-qubit gates in arrays coupled by 'always-on' interactions |
| title | Multi-qubit gates in arrays coupled by 'always-on' interactions |
| title_full | Multi-qubit gates in arrays coupled by 'always-on' interactions |
| title_fullStr | Multi-qubit gates in arrays coupled by 'always-on' interactions |
| title_full_unstemmed | Multi-qubit gates in arrays coupled by 'always-on' interactions |
| title_short | Multi-qubit gates in arrays coupled by 'always-on' interactions |
| title_sort | multi qubit gates in arrays coupled by always on interactions |
| work_keys_str_mv | AT benjamins multiqubitgatesinarrayscoupledbyalwaysoninteractions |