Most of the results published before 1975 were last included in our 1982 edition, Physics Letters 111B 1 （1982）. Some further obsolete results published before 1984 were last included in our 2006 edition, Journal of...Most of the results published before 1975 were last included in our 1982 edition, Physics Letters 111B 1 （1982）. Some further obsolete results published before 1984 were last included in our 2006 edition, Journal of Physics （generic for all A,B,E,G） G33 1 （2006）.展开更多
Nano-Copper and Cu/UDD (ultradispersed diamond) nanocomposites were separately prepared by reduction of CuCl2 aqueous solution and that doped with 0.7%(weight percent) of ultra-dispersed diamond. The as prepared nano-...Nano-Copper and Cu/UDD (ultradispersed diamond) nanocomposites were separately prepared by reduction of CuCl2 aqueous solution and that doped with 0.7%(weight percent) of ultra-dispersed diamond. The as prepared nano-crystals were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR) and electron paramagnetic resonance techniques (EPR). It was found that homogeneous nucleation dominated the aqueous reduction reaction at high concentration and the diameter of nano-copper decreased as the reaction time shortened, yet at lower concentration heterogeneous nucleation predominated and the doped UDD functioned as heterogeneous nucleation. Otherwise large number of free-radicals existed in the nano-composites. Both of nano-copper and Cu/UDD nanocomposites were strong catalysts for AP decomposition, with Cu/UDD being a more effective one. The higher decomposition temperature for AP was 119 ℃ lower than that without catalyst. And the exothermic quantity of decomposition was from 590 J·g-1 to 1 400 J·g-1 by mix 2% of the Cu/UDD nanocomposites.展开更多
Dynamical decoupling (DD) eliminates qubit-bath coupling by applying a sequence of instantaneous pulses.While qubit-bath couplings generally lead to qubit relaxation and dephasing,qubit-qubit couplings are often used ...Dynamical decoupling (DD) eliminates qubit-bath coupling by applying a sequence of instantaneous pulses.While qubit-bath couplings generally lead to qubit relaxation and dephasing,qubit-qubit couplings are often used to manipulate or control quantum states.We investigate the available control operations in two DD schemes,named periodic DD (PDD) and Uhrig DD (UDD),to see whether universal quantum computation can be realized in these decoupled systems.We find that universal control is possible using Heisenberg interaction in both periodically decoupled system and Uhrig decoupled system,and the available control operations under two kinds of DD sequences obey the same commutation relation.In the UDD case,we also derive a rough bound for control errors.展开更多
文摘Most of the results published before 1975 were last included in our 1982 edition, Physics Letters 111B 1 （1982）. Some further obsolete results published before 1984 were last included in our 2006 edition, Journal of Physics （generic for all A,B,E,G） G33 1 （2006）.
文摘Nano-Copper and Cu/UDD (ultradispersed diamond) nanocomposites were separately prepared by reduction of CuCl2 aqueous solution and that doped with 0.7%(weight percent) of ultra-dispersed diamond. The as prepared nano-crystals were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR) and electron paramagnetic resonance techniques (EPR). It was found that homogeneous nucleation dominated the aqueous reduction reaction at high concentration and the diameter of nano-copper decreased as the reaction time shortened, yet at lower concentration heterogeneous nucleation predominated and the doped UDD functioned as heterogeneous nucleation. Otherwise large number of free-radicals existed in the nano-composites. Both of nano-copper and Cu/UDD nanocomposites were strong catalysts for AP decomposition, with Cu/UDD being a more effective one. The higher decomposition temperature for AP was 119 ℃ lower than that without catalyst. And the exothermic quantity of decomposition was from 590 J·g-1 to 1 400 J·g-1 by mix 2% of the Cu/UDD nanocomposites.
基金supported by the National Natural Science Foundation of China(60774099,60821091,61134008)
文摘Dynamical decoupling (DD) eliminates qubit-bath coupling by applying a sequence of instantaneous pulses.While qubit-bath couplings generally lead to qubit relaxation and dephasing,qubit-qubit couplings are often used to manipulate or control quantum states.We investigate the available control operations in two DD schemes,named periodic DD (PDD) and Uhrig DD (UDD),to see whether universal quantum computation can be realized in these decoupled systems.We find that universal control is possible using Heisenberg interaction in both periodically decoupled system and Uhrig decoupled system,and the available control operations under two kinds of DD sequences obey the same commutation relation.In the UDD case,we also derive a rough bound for control errors.
