Enhancement of electron spin coherence by optical preparation of nuclear spins

Stepanenko, Dimitrije; Burkard, Guido; Giedke, Geza; Imamoglu, Atac

Enhancement of electron spin coherence by optical preparation of nuclear spins

Dateien

0512362v1.pdfGröße: 224.61 KBDownloads: 151

Datum

2005

Autor:innen

Stepanenko, Dimitrije

Burkard, Guido

Giedke, Geza

Imamoglu, Atac

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Physik

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Physical Review Letters. 2005, 96, 136401. Available under: doi: 10.1103/PhysRevLett.96.136401

Zusammenfassung

We study a large ensemble of nuclear spins interacting with a single electron spin in a quantum dot under optical excitation and photon detection. When a pair of applied laser fields satisfy two-photon resonance between the two ground electronic spin states, detection of light scattering from the intermediate exciton state acts as a weak quantum measurement of the effective magnetic (Overhauser) field due to the nuclear spins. If the spin were driven into a coherent population trapping state where no light scattering takes place, then the nuclear state would be projected into an eigenstate of the Overhauser field operator and electron decoherence due to nuclear spins would be suppressed: we show that this limit can be approached by adapting the laser frequencies when a photon is detected. We use a Lindblad equation to describe the time evolution of the driven system under photon emission and detection. Numerically, we find an increase of the electron coherence time from 5 ns to 500 ns after a preparation time of 10 microseconds.

Fachgebiet (DDC)

530 Physik

Schlagwörter

Overhauser effect, Semiconductor quantum dots, Light scattering, Excitons

Zitieren

ISO 690

STEPANENKO, Dimitrije, Guido BURKARD, Geza GIEDKE, Atac IMAMOGLU, 2005. Enhancement of electron spin coherence by optical preparation of nuclear spins. In: Physical Review Letters. 2005, 96, 136401. Available under: doi: 10.1103/PhysRevLett.96.136401

BibTex

@article{Stepanenko2005Enhan-9465,
  year={2005},
  doi={10.1103/PhysRevLett.96.136401},
  title={Enhancement of electron spin coherence by optical preparation of nuclear spins},
  volume={96},
  journal={Physical Review Letters},
  author={Stepanenko, Dimitrije and Burkard, Guido and Giedke, Geza and Imamoglu, Atac},
  note={Article Number: 136401}
}

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    <dcterms:abstract xml:lang="eng">We study a large ensemble of nuclear spins interacting with a single electron spin in a quantum dot under optical excitation and photon detection. When a pair of applied laser fields satisfy two-photon resonance between the two ground electronic spin states, detection of light scattering from the intermediate exciton state acts as a weak quantum measurement of the effective magnetic (Overhauser) field due to the nuclear spins. If the spin were driven into a coherent population trapping state where no light scattering takes place, then the nuclear state would be projected into an eigenstate of the Overhauser field operator and electron decoherence due to nuclear spins would be suppressed: we show that this limit can be approached by adapting the laser frequencies when a photon is detected. We use a Lindblad equation to describe the time evolution of the driven system under photon emission and detection. Numerically, we find an increase of the electron coherence time from 5 ns to 500 ns after a preparation time of 10 microseconds.</dcterms:abstract>
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