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Article: Many-body singlets by dynamic spin polarization

TitleMany-body singlets by dynamic spin polarization
Authors
Issue Date2011
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B - Condensed Matter And Materials Physics, 2011, v. 83 n. 20 How to Cite?
AbstractWe show that dynamic spin polarization by collective raising and lowering operators can drive a spin ensemble from arbitrary initial state to many-body singlets, the zero-collective-spin states with large-scale entanglement. For an ensemble of N arbitrary spins, both the variance of the collective spin and the number of unentangled spins can be reduced to O(1) [versus the typical value of O(N)], and in the steady state many-body singlets are occupied with a population of ∼20% independent of the ensemble size. We discuss a potential implementation in a mesoscopic ensemble of nuclear spins using dynamic nuclear spin polarization by an electron. The result is of twofold significance for spin quantum technology: (1) a cleaner surrounding and less quantum noise for the electron spin and (2) a resource of entanglement for nuclear-spin-based quantum information processing. The scheme can also be applied to other spin systems where collective raising and lowering operations are available. © 2011 American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/137492
ISSN
2014 Impact Factor: 3.736
2015 SCImago Journal Rankings: 1.933
ISI Accession Number ID
Funding AgencyGrant Number
Research Grant Council of Hong KongHKU 706309P
Funding Information:

This work was supported by the Research Grant Council of Hong Kong under Grant No. HKU 706309P. The author acknowledges technical support for numerical simulations from H. Y. Yu and helpful discussions with L. J. Sham, F. C. Zhang, X. D. Xu, and H. Y. Yu.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorYao, Wen_HK
dc.date.accessioned2011-08-26T14:26:15Z-
dc.date.available2011-08-26T14:26:15Z-
dc.date.issued2011en_HK
dc.identifier.citationPhysical Review B - Condensed Matter And Materials Physics, 2011, v. 83 n. 20en_HK
dc.identifier.issn1098-0121en_HK
dc.identifier.urihttp://hdl.handle.net/10722/137492-
dc.description.abstractWe show that dynamic spin polarization by collective raising and lowering operators can drive a spin ensemble from arbitrary initial state to many-body singlets, the zero-collective-spin states with large-scale entanglement. For an ensemble of N arbitrary spins, both the variance of the collective spin and the number of unentangled spins can be reduced to O(1) [versus the typical value of O(N)], and in the steady state many-body singlets are occupied with a population of ∼20% independent of the ensemble size. We discuss a potential implementation in a mesoscopic ensemble of nuclear spins using dynamic nuclear spin polarization by an electron. The result is of twofold significance for spin quantum technology: (1) a cleaner surrounding and less quantum noise for the electron spin and (2) a resource of entanglement for nuclear-spin-based quantum information processing. The scheme can also be applied to other spin systems where collective raising and lowering operations are available. © 2011 American Physical Society.en_HK
dc.languageengen_US
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/en_HK
dc.relation.ispartofPhysical Review B - Condensed Matter and Materials Physicsen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong Licenseen_US
dc.titleMany-body singlets by dynamic spin polarizationen_HK
dc.typeArticleen_HK
dc.identifier.emailYao, W: wangyao@hku.hken_HK
dc.identifier.authorityYao, W=rp00827en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevB.83.201308en_HK
dc.identifier.scopuseid_2-s2.0-79961099658en_HK
dc.identifier.hkuros185584en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79961099658&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume83en_HK
dc.identifier.issue20en_HK
dc.identifier.eissn1550-235X-
dc.identifier.isiWOS:000290867400003-
dc.publisher.placeUnited Statesen_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.citeulike9633506-

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