Room temperature CNOT operation in a diluted magnetic semiconductor quantum dot

So far, the CNOT operations in quantum dots are demonstrated using laser pulses of varying polarizations for resonant excitations of exciton and biexciton states. The appearance of exciton and biexciton states is possible only at cryogenic temperatures, which debars the realization of room temperature operation of quantum computation. Also, the use of various polarization states of lasers complicates CNOT operation. In the present paper, we propose a novel method wherein both the restrictions can be overcome by employing ultrafast magnetic pulse CNOT gate operation in a diluted magnetic semiconductor (DMS) quantum dot (QD). At room temperature, spin-split energy exceeds the thermal energy in Mn-doped InSb quantum dot, while magnetic field-assisted transitions facilitate CNOT operation by using only a circularly polarized laser pulse. Also, the fidelity calculation of the proposed CNOT gate is found to be appreciably large.