Quantum light switch

Davide Castelvecchi

鸣笛 杜

我们报道了一种全新的全光开关，该光开关是在半导体多量子阱中基于激子和双激子能级形成的EIT效应，利用量子相干相消效应来减小材料对探测光场的吸收，且探测光场吸收的强度可以通过控制光场来调节。若将控制光场设置为脉冲光场，则可以实现探测光场的开关调制，通过选取适当的控制光场的强度，可以得到约86%的开关效率。  We report a new all-optical switching. The all-optical switching is based on EIT effect of semiconductor multiple quantum wells exciton energy levels, the use of quantum coherence effects can reduce the absorption of the probe light field, and the intensity of the absorption for the probe light field can be adjusted by the control light field. If the control light field is pulse light field, the all-optical switching can be performed. We can select the appropriate intensity of control light field; the efficiency of switching can reach at almost 86%.

A. Yu. Leksin, A. P. Alodjants, Sergei M Arakelyan

Quantum analysis of the nonlinear dynamics and self-switching of unidirectional waves in nonlinear systems with distributed feedback is carried out in the Hartree approximation. Quantum limitations on the observation of self-switching are found for the polarization characteristics of light. The formation of nonclassical mesoscopic states of light is predicted. The phenomenon of optical “superfluidity” in systems with distributed feedback is discussed.

Andreas H. Trabesinger

Mohammad Reza Ghorbani Fard, Olesya V. Vershinina, A. V. Katsaba

We propose using a nanostructure with quantum dots to switch light pulses between superluminal and subluminal propagation. Additionally, by adjusting tunneling rates and incoherent pumping field, the speed of light pulses can be controlled with a 5 ps switching time.