Polarized light in quantum dot qubit under an applied external magnetic field

Single self-assembled quantum dot (SAQD) dependence on an external magnetic field has been theoretically and numerically studied. The carrier wave functions and energy eigenvalues have been evaluated and the differences between small and large quantum dots have been explored. The current investigation has shown the dependence of circular light polarization on an external magnetic field and on the size of the SAQD as well. Although the light polarization in the case of spin-polarized states along the direction [110] for large SAQD decreases by increasing the magnetic field, in the case of small dots the polarization increases. ©2009 The American Physical Society