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Generation and control of polarization-entangled photons from GaAs island quantum dots by an electric field

Author

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  • Mohsen Ghali

    (Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Katahira 2-1-1, Aoba-ku
    Present address: Physics Department, Faculty of Science, Kafrelsheikh University, 33516 Kafrelsheikh, Egypt.)

  • Keita Ohtani

    (Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Katahira 2-1-1, Aoba-ku)

  • Yuzo Ohno

    (Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Katahira 2-1-1, Aoba-ku)

  • Hideo Ohno

    (Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Katahira 2-1-1, Aoba-ku
    Center for Spintronics Integrated Systems, Tohoku University, Katahira 2-1-1, Aoba-ku)

Abstract

Semiconductor quantum dots are potential sources for generating polarization-entangled photons efficiently. The main prerequisite for such generation based on biexciton–exciton cascaded emission is to control the exciton fine-structure splitting. Among various techniques investigated for this purpose, an electric field is a promising means to facilitate the integration into optoelectronic devices. Here we demonstrate the generation of polarization-entangled photons from single GaAs quantum dots by an electric field. In contrast to previous studies, which were limited to In(Ga)As quantum dots, GaAs island quantum dots formed by a thickness fluctuation were used because they exhibit a larger oscillator strength and emit light with a shorter wavelength. A forward voltage was applied to a Schottky diode to control the fine-structure splitting. We observed a decrease and suppression in the fine-structure splitting of the studied single quantum dot with the field, which enabled us to generate polarization-entangled photons with a high fidelity of 0.72±0.05.

Suggested Citation

  • Mohsen Ghali & Keita Ohtani & Yuzo Ohno & Hideo Ohno, 2012. "Generation and control of polarization-entangled photons from GaAs island quantum dots by an electric field," Nature Communications, Nature, vol. 3(1), pages 1-6, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms1657
    DOI: 10.1038/ncomms1657
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