File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Control of electron spin decoherence caused by electron-nuclear spin dynamics in a quantum dot

TitleControl of electron spin decoherence caused by electron-nuclear spin dynamics in a quantum dot
Authors
Issue Date2007
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://www.iop.org/EJ/journal/NJP
Citation
New Journal Of Physics, 2007, v. 9 How to Cite?
AbstractControl of electron spin decoherence in contact with a mesoscopic bath of many interacting nuclear spins in an InAs quantum dot is studied by solving the coupled quantum dynamics. The nuclear spin bath, because of its bifurcated evolution predicated on the electron spin up or down state, measures the which-state information of the electron spin and hence diminishes its coherence. The many-body dynamics of the nuclear spin bath is solved with a pair-correlation approximation. In the relevant timescale, nuclear pair-wise flip-flops, as elementary excitations in the mesoscopic bath, can be mapped into the precession of non-interacting pseudo-spins. Such mapping provides a geometrical picture for understanding the decoherence and for devising control schemes. A close examination of nuclear bath dynamics reveals a wealth of phenomena and new possibilities of controlling the electron spin decoherence. For example, when the electron spin is flipped by a π-pulse at τ, its coherence will partially recover at √2τ as a consequence of quantum disentanglement from the mesoscopic bath. In contrast to the re-focusing of inhomogeneously broadened phases by conventional spin-echoes, the disentanglement is realized through shepherding quantum evolution of the bath state via control of the quantum object. A concatenated construction of pulse sequences can eliminate the decoherence with arbitrary accuracy, with the nuclear-nuclear spin interaction strength acting as the controlling small parameter. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
Persistent Identifierhttp://hdl.handle.net/10722/175075
ISSN
2015 Impact Factor: 3.57
2015 SCImago Journal Rankings: 1.902
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLiu, RBen_US
dc.contributor.authorYao, Wen_US
dc.contributor.authorSham, LJen_US
dc.date.accessioned2012-11-26T08:49:07Z-
dc.date.available2012-11-26T08:49:07Z-
dc.date.issued2007en_US
dc.identifier.citationNew Journal Of Physics, 2007, v. 9en_US
dc.identifier.issn1367-2630en_US
dc.identifier.urihttp://hdl.handle.net/10722/175075-
dc.description.abstractControl of electron spin decoherence in contact with a mesoscopic bath of many interacting nuclear spins in an InAs quantum dot is studied by solving the coupled quantum dynamics. The nuclear spin bath, because of its bifurcated evolution predicated on the electron spin up or down state, measures the which-state information of the electron spin and hence diminishes its coherence. The many-body dynamics of the nuclear spin bath is solved with a pair-correlation approximation. In the relevant timescale, nuclear pair-wise flip-flops, as elementary excitations in the mesoscopic bath, can be mapped into the precession of non-interacting pseudo-spins. Such mapping provides a geometrical picture for understanding the decoherence and for devising control schemes. A close examination of nuclear bath dynamics reveals a wealth of phenomena and new possibilities of controlling the electron spin decoherence. For example, when the electron spin is flipped by a π-pulse at τ, its coherence will partially recover at √2τ as a consequence of quantum disentanglement from the mesoscopic bath. In contrast to the re-focusing of inhomogeneously broadened phases by conventional spin-echoes, the disentanglement is realized through shepherding quantum evolution of the bath state via control of the quantum object. A concatenated construction of pulse sequences can eliminate the decoherence with arbitrary accuracy, with the nuclear-nuclear spin interaction strength acting as the controlling small parameter. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://www.iop.org/EJ/journal/NJPen_US
dc.relation.ispartofNew Journal of Physicsen_US
dc.titleControl of electron spin decoherence caused by electron-nuclear spin dynamics in a quantum doten_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.doi10.1088/1367-2630/9/7/226en_US
dc.identifier.scopuseid_2-s2.0-34547367295en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34547367295&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume9en_US
dc.identifier.isiWOS:000247953300004-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridLiu, RB=8927912500en_US
dc.identifier.scopusauthoridYao, W=35141935300en_US
dc.identifier.scopusauthoridSham, LJ=7006555193en_US
dc.identifier.citeulike1450936-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats