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An alternative scheme is proposed for generating the Greenberg-Horne-Zeilinger (GHZ) and W types of the entangled states with multiple superconducting quantum-interference device (SQUID) qubits in a single-mode microwave cavity field. In this scheme, there is no transfer of quantum information between the SQUIDs and the cavity, the cavity is always in the vacuum and thus the requirement on the quality of cavity is greatly loosened. In addition, during the process of the generation of the W entangled state, the present method does not involve a real excitation of intermediate levels. Thus, decoherence due to energy relaxation of intermediate levels is minimized.  相似文献   
2.
Coloured conical emission (CCE) is investigated experimentally in a β-barium borate crystal excited by intense second harmonic femtosecond pulses. Contrary sequences of green and red conical emission with variable diameters are observed at different incidence angles, which is consistent with the calculation results based on the phase matching condition. As its broad range spectrum, CCE offers an alternative means to produce an ultrafast broadband light source. It is found that the spectrum of green CE shifts toward longer wavelengths as the length of BBO crystal increased.  相似文献   
3.
在液晶显示器制造工艺中,为了防止反扭曲现象的发生,要在液晶中加入少量光活性物质以改善显示器的性能[1~3].为了保证主体液晶的使用性能不受添加剂的影响,通常使用螺旋扭曲能力较大的光活性材料以减少添加剂的用量,同时还要求光活性材料的螺距随温度的变化率要小.目前,符合上述要求的光活性添加剂大多为含有苯环或环己烷环或两种环均有的棒状结构的醇类或酯类化合物.因此研究具有上述结构特征的前手性酮的不对称还原在液晶材料的研究中具有十分重要的意义.  相似文献   
4.
采用有效质量框架下一维有限深势阱模型对InGaAsP多量子阱的组分和阱宽之间的关系进行了计算,利用更符合实验结果的Harrison模型来计算带阶,分别就晶格匹配和应变补偿两种情况进行了比较计算,最后根据要制作的全光功能开关的性能指标对计算结果进行了选择,得到最适合于制作光开关的材料.  相似文献   
5.
We propose an alternative scheme to prepare W state by using superconducting quantum-interference devices (SQUIDs) coupled to a largely-detuned cavity. The present scheme is based on evolution by adiabatic passage, where only by tuning adiabatically the Rabi frequencies of the classical microwave pulses we can obtain the standard W state without measurement or any auxiliary SQUIDs. Thus the procedure is simplified and the scheme can be achieved with very high success probability since the errors in dynamical or geometric ways can be avoided. In addition, the SQUID system and the cavity have no probability of being excited state. Thus decoherence caused by the excited-level spontaneous emission or the cavity decay is suppressed.  相似文献   
6.
阐述了中国传统文化在大学物理课堂教学中应用的可行性和重要意义.  相似文献   
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