Hyperfine and spin-orbit coupling effects on decay of spin-valley states in a carbon nanotube
The decay of spin-valley states is studied in a suspended carbon nanotube double quantum dot via leakage current in Pauli blockade and via dephasing and decoherence of a qubit. From the magnetic field dependence of the leakage current, hyperfine and spin-orbit contributions to relaxation from blocke...
| Main Authors: | , , , , , , , |
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| Format: | Journal article |
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American Physical Society
2017
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| _version_ | 1826306839427416064 |
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| author | Pei, T Palyi, A Mergenthaler, M Ares, N Mavalankar, A Warner, J Briggs, G Laird, E |
| author_facet | Pei, T Palyi, A Mergenthaler, M Ares, N Mavalankar, A Warner, J Briggs, G Laird, E |
| author_sort | Pei, T |
| collection | OXFORD |
| description | The decay of spin-valley states is studied in a suspended carbon nanotube double quantum dot via leakage current in Pauli blockade and via dephasing and decoherence of a qubit. From the magnetic field dependence of the leakage current, hyperfine and spin-orbit contributions to relaxation from blocked to unblocked states are identified and explained quantitatively by means of a simple model. The observed qubit dephasing rate is consistent with the hyperfine coupling strength extracted from this model and inconsistent with dephasing from charge noise. However, the qubit coherence time, although longer than previously achieved, is probably still limited by charge noise in the device. |
| first_indexed | 2024-03-07T06:53:58Z |
| format | Journal article |
| id | oxford-uuid:fd7e0d53-80e1-407f-82b4-d441664bdf56 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T06:53:58Z |
| publishDate | 2017 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:fd7e0d53-80e1-407f-82b4-d441664bdf562022-03-27T13:29:14ZHyperfine and spin-orbit coupling effects on decay of spin-valley states in a carbon nanotubeJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:fd7e0d53-80e1-407f-82b4-d441664bdf56Symplectic Elements at OxfordAmerican Physical Society2017Pei, TPalyi, AMergenthaler, MAres, NMavalankar, AWarner, JBriggs, GLaird, EThe decay of spin-valley states is studied in a suspended carbon nanotube double quantum dot via leakage current in Pauli blockade and via dephasing and decoherence of a qubit. From the magnetic field dependence of the leakage current, hyperfine and spin-orbit contributions to relaxation from blocked to unblocked states are identified and explained quantitatively by means of a simple model. The observed qubit dephasing rate is consistent with the hyperfine coupling strength extracted from this model and inconsistent with dephasing from charge noise. However, the qubit coherence time, although longer than previously achieved, is probably still limited by charge noise in the device. |
| spellingShingle | Pei, T Palyi, A Mergenthaler, M Ares, N Mavalankar, A Warner, J Briggs, G Laird, E Hyperfine and spin-orbit coupling effects on decay of spin-valley states in a carbon nanotube |
| title | Hyperfine and spin-orbit coupling effects on decay of spin-valley states in a carbon nanotube |
| title_full | Hyperfine and spin-orbit coupling effects on decay of spin-valley states in a carbon nanotube |
| title_fullStr | Hyperfine and spin-orbit coupling effects on decay of spin-valley states in a carbon nanotube |
| title_full_unstemmed | Hyperfine and spin-orbit coupling effects on decay of spin-valley states in a carbon nanotube |
| title_short | Hyperfine and spin-orbit coupling effects on decay of spin-valley states in a carbon nanotube |
| title_sort | hyperfine and spin orbit coupling effects on decay of spin valley states in a carbon nanotube |
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