TY  - JOUR
AU  - Ghali, Mohsen
AU  - Ohtani1, Keita
AU  - Ohno, Yuzo
AU  - Ohno, Hideo
PY  - 2012
DA  - 2012//
TI  - Generation and control of polarization-entangled photons from GaAs island quantum dots by an electric field
T2  - Nat. Comm.
JO  - Nature Communications
SP  - 6
VL  - 3
IS  - 661
KW  - fromIPMRAS
AB  - 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.
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=769), last updated on Sun, 06 May 2012 16:41:26 -0500
ID  - Ghali_etal2012
ER  -