Manipulating quantum coherence of charge states in interacting double-dot Aharonov–Bohm interferometers
We investigate the dynamics of charge-state coherence in a degenerate double-dot Aharonov–Bohm interferometer with finite inter-dot Coulomb interactions. The quantum coherence of the charge states is found to be sensitive to the transport setup configurations, involving both the single-electron impu...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2018-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/aab5cb |
| _version_ | 1797750751699664896 |
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| author | Jinshuang Jin Shikuan Wang Jiahuan Zhou Wei-Min Zhang YiJing Yan |
| author_facet | Jinshuang Jin Shikuan Wang Jiahuan Zhou Wei-Min Zhang YiJing Yan |
| author_sort | Jinshuang Jin |
| collection | DOAJ |
| description | We investigate the dynamics of charge-state coherence in a degenerate double-dot Aharonov–Bohm interferometer with finite inter-dot Coulomb interactions. The quantum coherence of the charge states is found to be sensitive to the transport setup configurations, involving both the single-electron impurity channels and the Coulomb-assisted ones. We numerically demonstrate the emergence of a complete coherence between the two charge states, with the relative phase being continuously controllable through the magnetic flux. Interestingly, a fully coherent charge qubit arises at the double-dots electron pair tunneling resonance condition, where the chemical potential of one electrode is tuned at the center between a single-electron impurity channel and the related Coulomb-assisted channel. This pure quantum state of charge qubit could be experimentally realized at the current–voltage characteristic turnover position, where differential conductance sign changes. We further elaborate the underlying mechanism for both the real-time and the stationary charge-states coherence in the double-dot systems of study. |
| first_indexed | 2024-03-12T16:37:24Z |
| format | Article |
| id | doaj.art-5cc0d1d6c50a4a37ba977c49079f64fa |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:37:24Z |
| publishDate | 2018-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-5cc0d1d6c50a4a37ba977c49079f64fa2023-08-08T14:48:45ZengIOP PublishingNew Journal of Physics1367-26302018-01-0120404304310.1088/1367-2630/aab5cbManipulating quantum coherence of charge states in interacting double-dot Aharonov–Bohm interferometersJinshuang Jin0Shikuan Wang1Jiahuan Zhou2Wei-Min Zhang3YiJing Yan4Department of Physics, Hangzhou Normal University , Hangzhou, Zhejiang 310036, People’s Republic of ChinaDepartment of Physics, Hangzhou Dianzi University , Hangzhou 310018, People’s Republic of ChinaDepartment of Physics, Hangzhou Normal University , Hangzhou, Zhejiang 310036, People’s Republic of ChinaDepartment of Physics and Center for Quantum Information Science, National Cheng Kung University , Tainan 70101, TaiwanHefei National Laboratory for Physical Sciences at the Microscale and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), University of Science and Technology of China , Hefei 230026, People’s Republic of ChinaWe investigate the dynamics of charge-state coherence in a degenerate double-dot Aharonov–Bohm interferometer with finite inter-dot Coulomb interactions. The quantum coherence of the charge states is found to be sensitive to the transport setup configurations, involving both the single-electron impurity channels and the Coulomb-assisted ones. We numerically demonstrate the emergence of a complete coherence between the two charge states, with the relative phase being continuously controllable through the magnetic flux. Interestingly, a fully coherent charge qubit arises at the double-dots electron pair tunneling resonance condition, where the chemical potential of one electrode is tuned at the center between a single-electron impurity channel and the related Coulomb-assisted channel. This pure quantum state of charge qubit could be experimentally realized at the current–voltage characteristic turnover position, where differential conductance sign changes. We further elaborate the underlying mechanism for both the real-time and the stationary charge-states coherence in the double-dot systems of study.https://doi.org/10.1088/1367-2630/aab5cbquantum coherenceCoulomb blockadequantum dot03.65.Yz71.27.+a73.23.Hk |
| spellingShingle | Jinshuang Jin Shikuan Wang Jiahuan Zhou Wei-Min Zhang YiJing Yan Manipulating quantum coherence of charge states in interacting double-dot Aharonov–Bohm interferometers New Journal of Physics quantum coherence Coulomb blockade quantum dot 03.65.Yz 71.27.+a 73.23.Hk |
| title | Manipulating quantum coherence of charge states in interacting double-dot Aharonov–Bohm interferometers |
| title_full | Manipulating quantum coherence of charge states in interacting double-dot Aharonov–Bohm interferometers |
| title_fullStr | Manipulating quantum coherence of charge states in interacting double-dot Aharonov–Bohm interferometers |
| title_full_unstemmed | Manipulating quantum coherence of charge states in interacting double-dot Aharonov–Bohm interferometers |
| title_short | Manipulating quantum coherence of charge states in interacting double-dot Aharonov–Bohm interferometers |
| title_sort | manipulating quantum coherence of charge states in interacting double dot aharonov bohm interferometers |
| topic | quantum coherence Coulomb blockade quantum dot 03.65.Yz 71.27.+a 73.23.Hk |
| url | https://doi.org/10.1088/1367-2630/aab5cb |
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