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.

到目前为止，量子点中的CNOT操作已通过使用具有不同偏振态的激光脉冲来激发激子和双激子态而得到了证明。激子和双激子态的出现只有在低温下才有可能，这阻碍了量子计算在室温下的实现。而且，激光器的各种偏振态的使用使CNOT操作复杂化。在本文中，我们提出了一种新颖的方法，其中可以通过在稀磁半导体（DMS）量子点（QD）中采用超快磁脉冲CNOT栅极操作来克服这两个限制。在室温下，自旋分裂能量超过了掺Mn的InSb量子点中的热能，而磁场辅助的跃迁仅通过使用圆偏振激光脉冲来促进CNOT操作。还，