We propose a practical entanglement concentration protocol （ECP） for a hybrid entangled state using quantum dots and a microcavity coupled system. A hybrid less-entangled state can he concentrated to a most-entangled state with a certain probability using only one ancillary single photon. Moreover, using this protocol, we can also concentrate an arbitrary three-particle less-entangled W state using two ancillary photons and classical communication. The proposed protocols provide us with a useful method to concentrate less-entangled states, which can he implemented with current technology.
Glass formation range of Bi2O3-B2O3-TeO2 system has been investigated （B2O3 ≤ 40 mol%）. Four glasses with compositions xBi2O3-B2O3-（70-x）TeO2 （x = 40, 50, 60 and 70 tool%） have been prepared by using melt quenching technique. The effect of Bi2O3 content on thermal stability, optical properties and structures of these four Bi2O3-B2O3-TeO2 glasses is systematically investigated by inductive coupled plasma emission spectrometer （ICP）, differential scanning calorimetry （DSC）, Raman spectra and X-ray photoelectron spectroscopy （XPS）. It is found that the density, refractive index and optical basicity increase with increasing Bi2O3. The Raman spectra and XPS spectra show that the glass network is mainly constituted by the [BiO6] octahedron, [TeO4] trigonal bipyramidal, [TeO3] trigonal pyramid, [BO3] trigonal pyramid and [B04] tetrahedron structural units. With increasing Bi2O3, the coordination number around B atom changes from 3 to 4 and [TeO4] units are converted to [TeO3] units. Bi5＋ ions may exist in Bi2O3-B2O3-TeO2 （BBT） system and their amount grows with increasing Bi2O3 content.
Guoying ZhaoYing TianHuiyan FanJunjie ZhangLili Hu
The phosphate glass doped with Gd^3＋, Tb^3＋ and Gd^3＋/Tb^3＋ were prepared by high temperature melting. The photo-luminescence behavior of Gd^3＋ and Tb^3＋ in phosphate glass were investigated by absorption, excitation, and emission spectroscopy. Energy transfer between Gd3＋ and Tb3＋ in phosphate glass was studied, and it was found that there were two energy transfer mechanisms between Gd3＋ and Tb3＋ in phosphate glass： one was from 4f7 level of Gd3＋ to the 4f8 level of Tb3＋, and the other was from 5d level of Tb^3＋to 4f^7 level of Gd^3＋. The new findings would be beneficial for the study of Tb^3＋-doped scintillating phosphate glass.
