All Optical Quantum CNOT Gate in Semiconductor Quantum Dots

Using density matrix approach the possibility of quantum logic operation in a single semiconductor quantum dot (QD) has been explored. The two photon excitation of the QD creates population in the biexciton state which is subsequently depopulated by the second pulse resonant with the biexciton-exciton transition. The theoretical analysis suggest that CNOT gate can be formed by choosing the pulses of appropriate pulse area.