Measurement of temporal correlations of the overhauser field in a double quantum dot.
In quantum dots made from materials with nonzero nuclear spins, hyperfine coupling creates a fluctuating effective Zeeman field (Overhauser field) felt by electrons, which can be a dominant source of spin qubit decoherence. We characterize the spectral properties of the fluctuating Overhauser field...
| Asıl Yazarlar: | , , , , , , |
|---|---|
| Materyal Türü: | Journal article |
| Dil: | English |
| Baskı/Yayın Bilgisi: |
2008
|
| _version_ | 1826260222510891008 |
|---|---|
| author | Reilly, D Taylor, J Laird, E Petta, JR Marcus, C Hanson, M Gossard, A |
| author_facet | Reilly, D Taylor, J Laird, E Petta, JR Marcus, C Hanson, M Gossard, A |
| author_sort | Reilly, D |
| collection | OXFORD |
| description | In quantum dots made from materials with nonzero nuclear spins, hyperfine coupling creates a fluctuating effective Zeeman field (Overhauser field) felt by electrons, which can be a dominant source of spin qubit decoherence. We characterize the spectral properties of the fluctuating Overhauser field in a GaAs double quantum dot by measuring correlation functions and power spectra of the rate of singlet-triplet mixing of two separated electrons. Away from zero field, spectral weight is concentrated below 10 Hz, with approximately 1/f2 dependence on frequency f. This is consistent with a model of nuclear spin diffusion, and indicates that decoherence can be largely suppressed by echo techniques. |
| first_indexed | 2024-03-06T19:02:14Z |
| format | Journal article |
| id | oxford-uuid:13ecc99e-aefa-49eb-b887-b863e31ab89c |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:02:14Z |
| publishDate | 2008 |
| record_format | dspace |
| spelling | oxford-uuid:13ecc99e-aefa-49eb-b887-b863e31ab89c2022-03-26T10:16:38ZMeasurement of temporal correlations of the overhauser field in a double quantum dot.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:13ecc99e-aefa-49eb-b887-b863e31ab89cEnglishSymplectic Elements at Oxford2008Reilly, DTaylor, JLaird, EPetta, JRMarcus, CHanson, MGossard, AIn quantum dots made from materials with nonzero nuclear spins, hyperfine coupling creates a fluctuating effective Zeeman field (Overhauser field) felt by electrons, which can be a dominant source of spin qubit decoherence. We characterize the spectral properties of the fluctuating Overhauser field in a GaAs double quantum dot by measuring correlation functions and power spectra of the rate of singlet-triplet mixing of two separated electrons. Away from zero field, spectral weight is concentrated below 10 Hz, with approximately 1/f2 dependence on frequency f. This is consistent with a model of nuclear spin diffusion, and indicates that decoherence can be largely suppressed by echo techniques. |
| spellingShingle | Reilly, D Taylor, J Laird, E Petta, JR Marcus, C Hanson, M Gossard, A Measurement of temporal correlations of the overhauser field in a double quantum dot. |
| title | Measurement of temporal correlations of the overhauser field in a double quantum dot. |
| title_full | Measurement of temporal correlations of the overhauser field in a double quantum dot. |
| title_fullStr | Measurement of temporal correlations of the overhauser field in a double quantum dot. |
| title_full_unstemmed | Measurement of temporal correlations of the overhauser field in a double quantum dot. |
| title_short | Measurement of temporal correlations of the overhauser field in a double quantum dot. |
| title_sort | measurement of temporal correlations of the overhauser field in a double quantum dot |
| work_keys_str_mv | AT reillyd measurementoftemporalcorrelationsoftheoverhauserfieldinadoublequantumdot AT taylorj measurementoftemporalcorrelationsoftheoverhauserfieldinadoublequantumdot AT lairde measurementoftemporalcorrelationsoftheoverhauserfieldinadoublequantumdot AT pettajr measurementoftemporalcorrelationsoftheoverhauserfieldinadoublequantumdot AT marcusc measurementoftemporalcorrelationsoftheoverhauserfieldinadoublequantumdot AT hansonm measurementoftemporalcorrelationsoftheoverhauserfieldinadoublequantumdot AT gossarda measurementoftemporalcorrelationsoftheoverhauserfieldinadoublequantumdot |