|
Realization of the Three-Qubit Toffoli Gate in Molecules
DU Jiang-Feng, SHI Ming-Jun, ZHOU Xian-Yi, FAN Yang-Mei, WU Ji-Hui, YE Bang-Jiao, WENG Hui-Min, HAN Rong-Dian,
Chin. Phys. Lett. 2000, 17 (12):
859-861
.
We present the experimental realization of this gate with a solution of chlorostyrene molecules. Our method does not depend heavily on the two-qubit controlled operation, which used to serve as the basic quantum operation in quantum computing. At present, we use transition operator that can be applied to all qubits in one operation. It appears that no experimental realization has yet been reported up to now regarding the implementation of quantum Toffoli gate using transition pulse on three-qubit nuclear magnetic resonance quantum computers. In addition, our method is experimentally convenient to be extended to more qubits.
|
|
High Order Centrifugal Distortion Corrections to Energy Levels of Asymmetric Top Molecules
LIU Yu-Yan, LIU Xiao-Yong, LIU Hong-Ping, GUO Yuan-Qing, HUANG Guang-Ming, LIN Jie-Li, GAO Hui
Chin. Phys. Lett. 2000, 17 (12):
879-881
.
High order centrifugal distortion terms have been derived and added to the effective Hamiltonian of asymmetric top molecules. Based on this Hamiltonian, a program in Fortran 77 has been developed for spectral analysis of asymmetric top molecules. The high order centrifugal distortion terms are found to be non-negligible even for the low-lying rotational transitions of molecules, such as H218O, subjected to severe centrifugal distortion effect, and for the high-lying rotational transitions of molecules, such as 14N16O2 subjected to the moderate centrifugal distortion effect.
|
|
BO2-F+ Centers in the Radiation-damaged YCOB Crystals
RUAN Yong-Feng, Hiroshi NAKAO, Takatomo SASAKI
Chin. Phys. Lett. 2000, 17 (12):
896-898
.
An intense paramagnetic EPR signal generated from x-ray-irradiated, powdered YCOB crystals was observed at the liquid nitrogen temperature for the first time. Five peaks, located at the positions where the effective g factor equals to 1.992, 1.986, 1.980, 1.974 and 1.965, labeled as A, B, C, D and E respectively, were observed. It is believed that the peaks A, B, C and D generated from the BO2-F+ center which is a single electron trapped in an oxygen vacancy which was originally occupied by an O2- ion bonded to a (BO3)3- anion group. The peak E is thought of coming from Y2+ ions that are formed by the Y3+ ions trapping electrons. The mechanism for the formation of the radiation-induced defects in the YCOB crystals is suggested.
|
|
Monte Carlo Simulation of Light Transport in Five-Layered Skin Tissue
XUE Ling-Ling, ZHANG Chun-Ping, WANG Xin-Yu, ZHU Ming-Yao, ZHANG Lian-Shun, CHI Rong-Hua, ZHANG Jian-Dong, ZHANG Guang-Yin
Chin. Phys. Lett. 2000, 17 (12):
909-911
.
The light propagation and distribution in skin tissue is studied by using Monte Carlo technique. The radially resolved diffuse reflectance R and transmittance T vs radius r , angularly resolved R and T vs the exiting angle of the photon, absorption energy density A and internal Auence F vs r and z are simulated. Our results reveal that the light distribution for Gaussian beam is more centralized and its change is more rapid than those of circularly flat beam under the same incident energy and radius, no matter what R and T or A and F are. In addition, except that R(r) for circularly flat beam needs to be fitted by 15-order curve, the others can be fitted by 5-order or 6-order curve.
|
|
FTIR Characterization of Fluorine Doped Silicon Dioxide Thin Films Deposited by Plasma Enhanced Chemical Vapor Deposition
WANG Peng-Fei, DING Shi-Jin, ZHANG Wei, ZHANG Jim-Yun, WANG Ji-Tao, WEI William Lee
Chin. Phys. Lett. 2000, 17 (12):
912-914
.
Fluorine doped silicon dioxide (SiOF) thin films have been prepared by plasma enhanced chemical vapor deposition. The Fourier transform infrared spectrometry (FTIR) spectra of SiOF films are deliberated to reveal the structure change of SiO2 and the mechanism of dielectric constant reduction after doping fluorine. When F is doped in SiO2 films, the Si-O stretching absorption peak will have a blue-shift due to increase of the partial charge of the O atom. The FTIR spectra indicate that some Si-OH components in the thin film can be removed after doping fluorine. These changes reduce the ionic and orientational polarization, and result in the reduction in dielectric constant of the film. According to Gaussian fitting, it is found that the Si-F2 bonds will appear in the SiOF film with increase of the fluorine content. The Si-F2 structures are liable to react with water, and cause the same increase of absorbed moisture in the film.
|
|
A New Method for Experimental Determination of Compressional Velocities in Rocks and Minerals at High-pressure
LIU Yong-Gang, XIE Hong-Sen, GUO Jie, ZHOU Wen-Ge, XU Ji-An, ZHAO Zhi-Dan
Chin. Phys. Lett. 2000, 17 (12):
924-926
.
A transmission-reflection-combined new method is presented for measuring elastic velocities of rocks and minerals at elevated temperature and pressure, which resolves the problems of gradients of temperature and pressure existing in original sample assembly with a pyrophyllite cube. At room temperature and pressure up to 3 GPa, single-crystal quartz and eclogite were used to provide samples under test, respectively. The results of this work agree with the previous measurements very well within the error range. By the use of this new technique, more precise and reasonable data of elastic properties of rocks and minerals at elevated temperature and pressure can be achieved.
|
28 articles
|