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Article: Feedback control of nuclear hyperfine fields in a double quantum dot

TitleFeedback control of nuclear hyperfine fields in a double quantum dot
Authors
Issue Date2010
PublisherInstitute of Physics Publishing Ltd.. The Journal's web site is located at http://iopscience.iop.org/0295-5075
Citation
Epl, 2010, v. 92 n. 1 How to Cite?
AbstractIn a coupled double-quantum-dot system, we present a theory for the interplay between electron and nuclear spins when the two-electron singlet state is brought into resonance with one triplet state in moderate external magnetic field. We show that the quantum interference between first-order and second-order hyperfine processes can lead to a feedback mechanism for manipulating the nuclear hyperfine fields. In a uniform external field, positive-and negativefeedback controls can be realized for the gradient of the longitudinal hyperfine field as well as the average transverse hyperfine field in the double dot. The negative feedback which suppresses fluctuations in the longitudinal nuclear field gradient can enhance the decoherence time of a singlettriplet qubit to microsecond regime. We discuss the possibility of enhancing the decoherence time of each individual spin in a cluster of dots using the negative-feedback control on the transverse nuclear field. Copyright © EPLA, 2010.
Persistent Identifierhttp://hdl.handle.net/10722/134444
ISSN
2015 Impact Factor: 1.963
2015 SCImago Journal Rankings: 0.565
ISI Accession Number ID
Funding AgencyGrant Number
Research Grant Council of Hong KongHKU 706309P
Funding Information:

WY acknowledges stimulating discussions with XIAODONG Xu, D. G. Steel, D. Gammon and L. J. Sham. The work was supported by the Research Grant Council of Hong Kong under Grant No. HKU 706309P.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorYao, Wen_HK
dc.contributor.authorLuo, Yen_HK
dc.date.accessioned2011-06-17T09:20:57Z-
dc.date.available2011-06-17T09:20:57Z-
dc.date.issued2010en_HK
dc.identifier.citationEpl, 2010, v. 92 n. 1en_HK
dc.identifier.issn0295-5075en_HK
dc.identifier.urihttp://hdl.handle.net/10722/134444-
dc.description.abstractIn a coupled double-quantum-dot system, we present a theory for the interplay between electron and nuclear spins when the two-electron singlet state is brought into resonance with one triplet state in moderate external magnetic field. We show that the quantum interference between first-order and second-order hyperfine processes can lead to a feedback mechanism for manipulating the nuclear hyperfine fields. In a uniform external field, positive-and negativefeedback controls can be realized for the gradient of the longitudinal hyperfine field as well as the average transverse hyperfine field in the double dot. The negative feedback which suppresses fluctuations in the longitudinal nuclear field gradient can enhance the decoherence time of a singlettriplet qubit to microsecond regime. We discuss the possibility of enhancing the decoherence time of each individual spin in a cluster of dots using the negative-feedback control on the transverse nuclear field. Copyright © EPLA, 2010.en_HK
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd.. The Journal's web site is located at http://iopscience.iop.org/0295-5075 en_HK
dc.relation.ispartofEPLen_HK
dc.rightsThe original publication is available at http://iopscience.iop.org/0295-5075/-
dc.titleFeedback control of nuclear hyperfine fields in a double quantum doten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0295-5075&volume=92&issue=1, article no. 17008&spage=17008&epage=p1&date=2010&atitle=Feedback+control+of+nuclear+hyperfine+fields+in+double+quantum+dot-
dc.identifier.emailYao, W: wangyao@hku.hken_HK
dc.identifier.authorityYao, W=rp00827en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1209/0295-5075/92/17008en_HK
dc.identifier.scopuseid_2-s2.0-78751646597en_HK
dc.identifier.hkuros185588en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-78751646597&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume92en_HK
dc.identifier.issue1en_HK
dc.identifier.spage17008-p1en_US
dc.identifier.epage17008-p6en_US
dc.identifier.isiWOS:000284469900031-
dc.publisher.placeUnited Kingdomen_HK
dc.relation.projectOptical preparation of nuclear spin bath for enhancing single electron spin coherence time in a quantum dot-
dc.identifier.scopusauthoridYao, W=35141935300en_HK
dc.identifier.scopusauthoridLuo, Y=36930622500en_HK

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