Photon-assisted tunneling and charge dephasing in a carbon nanotube double quantum dot
We report microwave-driven photon-assisted tunneling in a suspended carbon nanotube double quantum dot. From the resonant linewidth at a temperature of 13 mK, the charge-dephasing time is determined to be 280 ± 30 ps. The linewidth is independent of driving frequency, but increases with increasing t...
| Main Authors: | , , , , , |
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| Format: | Journal article |
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American Physical Society
2016
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| _version_ | 1826303477758820352 |
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| author | Laird, E Mavalankar, A Pei, T Gauger, E Warner, J Briggs, G |
| author_facet | Laird, E Mavalankar, A Pei, T Gauger, E Warner, J Briggs, G |
| author_sort | Laird, E |
| collection | OXFORD |
| description | We report microwave-driven photon-assisted tunneling in a suspended carbon nanotube double quantum dot. From the resonant linewidth at a temperature of 13 mK, the charge-dephasing time is determined to be 280 ± 30 ps. The linewidth is independent of driving frequency, but increases with increasing temperature. The moderate temperature dependence is inconsistent with expectations from electron-phonon coupling alone, but consistent with charge noise arising in the device. The extracted level of charge noise is comparable with that expected from previous measurements of a valley-spin qubit, where it was hypothesized to be the main cause of qubit decoherence. Our results suggest a possible route towards improved valley-spin qubits. |
| first_indexed | 2024-03-07T06:03:18Z |
| format | Journal article |
| id | oxford-uuid:ecf47df6-a494-466d-9aa0-8ef1b9fc63ca |
| institution | University of Oxford |
| last_indexed | 2024-03-07T06:03:18Z |
| publishDate | 2016 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:ecf47df6-a494-466d-9aa0-8ef1b9fc63ca2022-03-27T11:21:26ZPhoton-assisted tunneling and charge dephasing in a carbon nanotube double quantum dotJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ecf47df6-a494-466d-9aa0-8ef1b9fc63caSymplectic Elements at OxfordAmerican Physical Society2016Laird, EMavalankar, APei, TGauger, EWarner, JBriggs, GWe report microwave-driven photon-assisted tunneling in a suspended carbon nanotube double quantum dot. From the resonant linewidth at a temperature of 13 mK, the charge-dephasing time is determined to be 280 ± 30 ps. The linewidth is independent of driving frequency, but increases with increasing temperature. The moderate temperature dependence is inconsistent with expectations from electron-phonon coupling alone, but consistent with charge noise arising in the device. The extracted level of charge noise is comparable with that expected from previous measurements of a valley-spin qubit, where it was hypothesized to be the main cause of qubit decoherence. Our results suggest a possible route towards improved valley-spin qubits. |
| spellingShingle | Laird, E Mavalankar, A Pei, T Gauger, E Warner, J Briggs, G Photon-assisted tunneling and charge dephasing in a carbon nanotube double quantum dot |
| title | Photon-assisted tunneling and charge dephasing in a carbon nanotube double quantum dot |
| title_full | Photon-assisted tunneling and charge dephasing in a carbon nanotube double quantum dot |
| title_fullStr | Photon-assisted tunneling and charge dephasing in a carbon nanotube double quantum dot |
| title_full_unstemmed | Photon-assisted tunneling and charge dephasing in a carbon nanotube double quantum dot |
| title_short | Photon-assisted tunneling and charge dephasing in a carbon nanotube double quantum dot |
| title_sort | photon assisted tunneling and charge dephasing in a carbon nanotube double quantum dot |
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