二能级系统自发辐射的动力学抑制(英文)

Dynamical suppression of spontaneous emission in two-level atom

研究了在二能级原子系统中有环境诱导的退相干的控制问题.通过对量子位系统施加适当的扰动可以减少由自发辐射引起的退相干.本文提出了一种新的基于频率位移技术和宇称反演技术的机制.这种机制可由两束均匀经典大失谐光场作用于原子来实现.通过应用这种机制,在存在自发辐射的情况下,可以有效地抑制退相干.

Dynamical control of decoherence induced by the environment in a two-level atom system is investigated. We choose the suitable perturbations acting on the qubit system to decrease the decoherence due to spontaneous emission damping. The scheme proposed here is based on the frequency-displacement technique and the parity-kick technique, which are realized by two homogeneous classical large detuned optical fidds with different frequencies added to the system. By applying this scheme, in presence of spontaneous emission, the decoherence can be efficiently suppressed.