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Article: Optically controlled locking of the nuclear field via coherent dark-state sopctroscopy

TitleOptically controlled locking of the nuclear field via coherent dark-state sopctroscopy
Authors
Issue Date2009
PublisherNature Publishing Group. The Journal's web site is located at http://www.nature.com/nature
Citation
Nature, 2009, v. 459 n. 7250, p. 1105-1109 How to Cite?
AbstractA single electron or hole spin trapped inside a semiconductor quantum dot forms the foundation for many proposed quantum logic devices 1-6. In group III-V materials, the resonance and coherence between two ground states of the single spin are inevitably affected by the lattice nuclear spins through the hyperfine interaction 7-9, while the dynamics of the single spin also influence the nuclear environment 10-15. Recent efforts 12,16 have been made to protect the coherence of spins in quantum dots by suppressing the nuclear spin fluctuations. However, coherent, control of a single spin in a single dot with simultaneous suppression of the nuclear fluctuations has yet. to be achieved. Here we report the suppression of nuclear field fluctuations in a singly charged quantum dot to well below the thermal value, as shown by an enhancement, of the single electron spin dephasing time T 2 *, which we measure using coherent dark-state spectroscopy. The suppression of nuclear fluctuations is found to result from a hole-spin assisted dynamic nuclear spin polarization feedback process, where the stable value of the nuclear field is determined only by the laser frequencies at fixed laser powers. This nuclear field locking is further demonstrated in a three-laser measurement, indicating a possible enhancement of the electron spin T 2 * by a factor of several hundred. This is a simple and powerful method of enhancing the electron spin coherence time without use of 'spin echo'-type techniques 8,12. We expect that our results will enable the reproducible preparation of the nuclear spin environment for repetitive control and measurement of a single spin with minimal statistical broadening. ©2009 Macmlllan Publishers Limited. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/175162
ISSN
2015 Impact Factor: 38.138
2015 SCImago Journal Rankings: 21.936
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorXu, Xen_US
dc.contributor.authorYao, Wen_US
dc.contributor.authorSun, Ben_US
dc.contributor.authorSteel, DGen_US
dc.contributor.authorBracker, ASen_US
dc.contributor.authorGammon, Den_US
dc.contributor.authorSham, LJen_US
dc.date.accessioned2012-11-26T08:49:30Z-
dc.date.available2012-11-26T08:49:30Z-
dc.date.issued2009en_US
dc.identifier.citationNature, 2009, v. 459 n. 7250, p. 1105-1109en_US
dc.identifier.issn0028-0836en_US
dc.identifier.urihttp://hdl.handle.net/10722/175162-
dc.description.abstractA single electron or hole spin trapped inside a semiconductor quantum dot forms the foundation for many proposed quantum logic devices 1-6. In group III-V materials, the resonance and coherence between two ground states of the single spin are inevitably affected by the lattice nuclear spins through the hyperfine interaction 7-9, while the dynamics of the single spin also influence the nuclear environment 10-15. Recent efforts 12,16 have been made to protect the coherence of spins in quantum dots by suppressing the nuclear spin fluctuations. However, coherent, control of a single spin in a single dot with simultaneous suppression of the nuclear fluctuations has yet. to be achieved. Here we report the suppression of nuclear field fluctuations in a singly charged quantum dot to well below the thermal value, as shown by an enhancement, of the single electron spin dephasing time T 2 *, which we measure using coherent dark-state spectroscopy. The suppression of nuclear fluctuations is found to result from a hole-spin assisted dynamic nuclear spin polarization feedback process, where the stable value of the nuclear field is determined only by the laser frequencies at fixed laser powers. This nuclear field locking is further demonstrated in a three-laser measurement, indicating a possible enhancement of the electron spin T 2 * by a factor of several hundred. This is a simple and powerful method of enhancing the electron spin coherence time without use of 'spin echo'-type techniques 8,12. We expect that our results will enable the reproducible preparation of the nuclear spin environment for repetitive control and measurement of a single spin with minimal statistical broadening. ©2009 Macmlllan Publishers Limited. All rights reserved.en_US
dc.languageengen_US
dc.publisherNature Publishing Group. The Journal's web site is located at http://www.nature.com/natureen_US
dc.relation.ispartofNatureen_US
dc.titleOptically controlled locking of the nuclear field via coherent dark-state sopctroscopyen_US
dc.typeArticleen_US
dc.identifier.emailYao, W: wangyao@hku.hken_US
dc.identifier.authorityYao, W=rp00827en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1038/nature08120en_US
dc.identifier.pmid19553994-
dc.identifier.scopuseid_2-s2.0-67649518197en_US
dc.identifier.hkuros157835-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-67649518197&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume459en_US
dc.identifier.issue7250en_US
dc.identifier.spage1105en_US
dc.identifier.epage1109en_US
dc.identifier.eissn1476-4687-
dc.identifier.isiWOS:000267636700038-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridXu, X=7405294926en_US
dc.identifier.scopusauthoridYao, W=35141935300en_US
dc.identifier.scopusauthoridSun, B=19640566500en_US
dc.identifier.scopusauthoridSteel, DG=7101949419en_US
dc.identifier.scopusauthoridBracker, AS=7004038928en_US
dc.identifier.scopusauthoridGammon, D=7005521238en_US
dc.identifier.scopusauthoridSham, LJ=7006555193en_US
dc.identifier.citeulike4959879-

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