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Scalable Quantum Information Transfer between Individual Nitrogen-Vacancy Centers by a Hybrid Quantum Interface
Pei Pei, He-Fei Huang, Yan-Qing Guo, He-Shan Song
Chin. Phys. Lett. 2016, 33 (02):
020301
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DOI: 10.1088/0256-307X/33/2/020301
We develop a design of a hybrid quantum interface for quantum information transfer (QIT), adopting a nanomechanical resonator as the intermedium, which is magnetically coupled with individual nitrogen-vacancy centers as the solid qubits, while capacitively coupled with a coplanar waveguide resonator as the quantum data bus. We describe the Hamiltonian of the model, and analytically demonstrate the QIT for both the resonant interaction and large detuning cases. The hybrid quantum interface allows for QIT between arbitrarily selected individual nitrogen-vacancy centers, and has advantages of the scalability and controllability. Our methods open an alternative perspective for implementing QIT, which is important during quantum storing or processing procedures in quantum computing.
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Electronic States of Difluorocarbene Calculated by Multireference Configuration Interaction Method
Er-Ping Sun, Ting-Qi Ren, Qi-Xin Liu, Quan Miao, Jin-Juan Zhang, Hai-Feng Xu, Bing Yan
Chin. Phys. Lett. 2016, 33 (02):
023101
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DOI: 10.1088/0256-307X/33/2/023101
We investigate the geometries and energies of seven electronic states $\tilde {X}$$^{1}\!A_{1}$, $\tilde {A}$$^{1}\!B_{1}$, $\tilde {a}$$^{3}\!B_{1}$, $\tilde {B}$$^{1}\!A_{2}$, $\tilde {b}$$^{3}\!A_{2}$, $\tilde {C}$$^{1}\!B_{2}$ and $\tilde {c}$$^{3}\!B_{2}$ of CF$_{2}$ carbene using internally contracted multireference configuration interaction methods including Davidson correction (icMRCI+Q) with different basis sets aug-cc-pVXZ (X=T, Q, 5). For the first time, the potential energy curves of electronic states of CF$_{2}$ related to the lowest dissociation limit are calculated at the icMRCI+Q/aug-cc-pVTZ level. The ab initio results will further increase our understanding of the structures and dynamics of electronic states of CF$_{2}$ radical.
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Molecular Application of a State Specific Multi-Reference Brillouin–Wigner Perturbation Theory
H. Aksu
Chin. Phys. Lett. 2016, 33 (02):
023102
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DOI: 10.1088/0256-307X/33/2/023102
The single reference second order Brillouin–Wigner perturbation theory recently developed, which eliminates its size-extensivity error, has been generalized to state-specific, multi-reference (SS-MR), BWPT2 providing a size-extensive correction to the electron correlation problem for systems that demand the use of a multi-reference function. Illustrative numerical tests of the size-extensivity corrections are made for widely used molecules in their ground states, which are pronounced multi-reference characteristics. We have implemented two-reference and three-reference cases for CH$_{2}$, BH and bond breaking process in the ground states of HF molecules. The results are compared with the rigorously size-extensive methods such as the M?ller–Plesset perturbation theory, i.e., MP2, full configuration interaction (Full-CI) and allied methods using the same basis sets.
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High-Power Passively Q-Switched Nd:YAG Laser at 1112nm with a Cr$^{4+}$:YAG Saturable Absorber
Yang-Yang Dun, Ping Li, Xiao-Han Chen, Bao-Min Ma
Chin. Phys. Lett. 2016, 33 (02):
024201
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DOI: 10.1088/0256-307X/33/2/024201
A high-power passively Q-switched Nd:YAG laser operating at 1112 nm with Cr$^{4+}$:YAG as a saturable absorber is demonstrated. Under 808 nm diode-direct pumping, the maximum average output power of 2.73 W is achieved at the pump power of 16.65 W, corresponding to an optical-to-optical conversion efficiency of 16.4%. At the same time, the pulse width, pulse repetition rate, single pulse energy and peak power are 27.2 ns, 9 kHz, 303.3 µJ and 11.2 kW, respectively. As far as we know, the result gives the highest average output power at 1112 nm generated by an 808 nm diode-end-pumped Nd:YAG laser.
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Pressure and Time Dependences of the Supercooled Liquid-to-Liquid Transition in Sulfur
Dou-Dou Zhang, Xiu-Ru Liu, Zhu He, Shi-Ming Hong
Chin. Phys. Lett. 2016, 33 (02):
026301
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DOI: 10.1088/0256-307X/33/2/026301
Thermal behavior of bulk amorphous sulfur is investigated by in situ temperature measurements at high pressures of 0.9, 1.4 and 2.1 GPa, and under different heating rates of 8, 10 and 12 K/min at 0.9 GPa. The results show that the onset temperature of the transition from the supercooled liquid to the liquid state for sulfur increases with the pressure and the heating rate. It is deduced that the transition does not follow the Clapeyron equation, indicating considerable coupling of the molecular structure change in the transition. Along with the data at ambient pressure and high pressure, we present a dynamic diagram to demonstrate the relationship between the amorphous solid, supercooled liquid, liquid, and crystal phases of sulfur, and suggest an experimental approach to establish pressure–temperature–time transition diagrams for supercooled liquid and liquid.
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Effect of Chromium on Structure and Tribological Properties of Hydrogenated Cr/a-C:H Films Prepared via a Reactive Magnetron Sputtering System
Long Liu, Sheng-Guo Zhou, Zheng-Bing Liu, Yue-Chen Wang, Li-Qiu Ma
Chin. Phys. Lett. 2016, 33 (02):
026801
.
DOI: 10.1088/0256-307X/33/2/026801
Hydrogenated Cr-incorporated carbon films (Cr/a-C:H) are deposited successfully by using a dc reactive magnetron sputtering system. The structure and mechanical properties of the as-deposited Cr/a-C:H films are characterized systematically by field-emission scanning electron microscope, x-ray diffraction, Raman spectra, nanoindentation and scratch. It is shown that optimal Cr metal forms nanocrystalline carbide to improve the hardness, toughness and adhesion strength in the amorphous carbon matrix, which possesses relatively higher nano-hardness of 15.7 GPa, elastic modulus of 126.8 GPa and best adhesion strength with critical load ($L_{\rm C})$ of 36 N for the Cr/a-C:H film deposited at CH$_{4}$ flow rate of 20 sccm. The friction and wear behaviors of as-deposited Cr/a-C:H films are evaluated under both the ambient air and deionized water conditions. The results reveal that it can achieve superior low friction and anti-wear performance for the Cr/a-C:H film deposited at CH$_{4}$ flow rate of 20 sccm under the ambient air condition, and the friction coefficient and wear rate tested in deionized water condition are relatively lower compared with those tested under the ambient air condition for each film. Superior combination of mechanical and tribological properties for the Cr/a-C:H film should be a good candidate for engineering applications.
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The Hole Transport Characteristics of 1, 4, 5, 8, 9 and 11-Hexaazatriphenylene-Hexacarbonitrile by Blending
Yan-Ping Wang, Jin-Ying Huang, Jiang-Shan Chen, Xian-Feng Qiao, De-Zhi Yang, Dong-Ge Ma, Li-Song Dong
Chin. Phys. Lett. 2016, 33 (02):
027302
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DOI: 10.1088/0256-307X/33/2/027302
The hole transport characteristics of molecule blends of 1, 4, 5, 8, 9 and 11-hexaazatriphenylene-hexacarbonitrile (HAT-CN): N,N'-di(naphthalene-1-yl)-N,N'-diphenyl-benzidine (NPB) and HAT-CN: 4,4'-cyclohexylidenebis[N,N-bis(4-methylphenyl)benzenamine] (TAPC) with various NPB and TAPC mixing concentrations (5–90 wt%) are studied. When the concentration is in the range of 5–80 wt%, it is found that the hole conductions in the two blends are space-charge-limited current (SCLC) with free trap distributions. The current–voltage characteristics of the two blends show SCLC with exponential trap distributions at the concentration of 90 wt%. The hole mobilities of the two blends are very close (10$^{-4}$–10$^{-3}$ cm$^{2}$V$^{-1}$s$^{-1}$), the dependence of electric field and temperature can be described by the modified Poole–Frenkel model. The hole mobility and activation energy of the two blends depending on concentration are similar.
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Analyzing Bandwidth on the Microwave Absorber by the Interface Reflection Model
Liang Qiao, Tao Wang, Zhong-Lei Mei, Xi-Ling Li, Wen-Bo Sui, Li-Yun Tang, Fa-Shen Li
Chin. Phys. Lett. 2016, 33 (02):
027502
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DOI: 10.1088/0256-307X/33/2/027502
Metallic flaky sendust particles are prepared for use as fillers in electromagnetic attenuation composites. We report the interface reflection model to divide the broad bandwidth into electromagnetic loss and quarter-wavelength ($\lambda/4$) cancelation. Combining with the face reflection calculation, we identify the electromagnetic loss originated from skin effect, which is used to explain over half of the absorbed energy in high frequency band. Most importantly, the unique electromagnetic loss cannot generate the reflection loss (RL) peak. Using the phase relation of face reflection, we show evidence that the $\lambda/4$ cancelation is vital to generate the RL peak. The calculated energy loss agrees well with the experimental data and lays the foundation for further research.
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Characteristics of Laser-Induced Surface and Bulk Damage of Large-Aperture Deuterated Potassium Dihydrogen Phosphate at 351nm
Wei Han, Li-Dan Zhou, Yong Xiang, Ye Tian, Fang Wang, Fu-Quan Li, Li-Quan Wang, Bin Feng, Jun-Pu Zhao, Kui-Xing Zheng, Qi-Hua Zhu, Xiao-Feng Wei, Wan-Guo Zheng, Ma-Li Gong
Chin. Phys. Lett. 2016, 33 (02):
027803
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DOI: 10.1088/0256-307X/33/2/027803
Deuterated potassium dihydrogen phosphate damage performance at 351 nm is studied on a large-aperture laser system. Bulk and rear-surface damage are initiated under the 3$\omega$ fluences of 6.7 J/cm$^{2}$ and 3 J/cm$^{2}$, and show different growth characteristics under multiple laser irradiations with the fluence of 6 J/cm$^{2}$. The size and number of bulk damage keep unchanged once initiated. However, surface damage size also does not grow, while surface damage number increases linearly with laser shots. Different damage thresholds and growth behaviors suggest different formations of bulk and surface damage precursors. The cause of surface damage is supposed to be near-surface absorbing particles buried under the sol-gel coating.
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B–C Bond in Diamond Single Crystal Synthesized with h-BN Additive at High Pressure and High Temperature
Yong Li, Zhen-Xiang Zhou, Xue-Mao Guan, Shang-Sheng Li, Ying Wang, Xiao-Peng Jia, Hong-An Ma
Chin. Phys. Lett. 2016, 33 (02):
028101
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DOI: 10.1088/0256-307X/33/2/028101
The synthesis of diamond single crystal in the Fe$_{64}$Ni$_{36}$-C system with h-BN additive is investigated at pressure 6.5 GPa and temperature range of 1300–1400$^{\circ}\!$C. The color of the obtained diamond crystals translates from yellow to dark green with increasing the h-BN addition. Fourier-transform infrared (FTIR) results indicate that $sp^{2}$ hybridization B-N-B and B-N structures generate when the additive content reaches a certain value in the system. The two peaks are located at 745 and 1425 cm$^{-1}$, respectively. Furthermore, the FTIR characteristic peak resulting from nitrogen pairs is noticed and it tends to vanish when the h-BN addition reaches 1.1 wt%. Furthermore, Raman peak of the synthesized diamond shifts down to a lower wavenumber with increasing the h-BN addition content in the synthesis system.
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The Structural Stability of Alpha-Helix Determined by the Preference of Amino Acids
Xiao-Xiao Xie, Jun-Wei Li, Shao-Ying Xiao, Yu-Zhi Liu, Hui Liu, Jin-Peng Geng, Su-Hua Zhang, Hui Yu, Yong Zhan, Hai-Long An
Chin. Phys. Lett. 2016, 33 (02):
028701
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DOI: 10.1088/0256-307X/33/2/028701
To accomplish their functions, proteins have to achieve different conformations accompanied by conformational transitions. However, the relationship between the preference of amino acids and the stability of the secondary structure is still unclear. Here we perform molecular simulations on a series of helical structures. Our data show that the dissociation energy of the helical structure is related to the preference of amino acids, and the electrostatic repulsion of the residue $i$ and $i+3/4$ with the same sign of charge destabilizes the alpha helix.
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Identifying Influence of Nodes in Complex Networks with Coreness Centrality: Decreasing the Impact of Densely Local Connection
Yi-Run Ruan, Song-Yang Lao, Yan-Dong Xiao, Jun-De Wang, Liang Bai
Chin. Phys. Lett. 2016, 33 (02):
028901
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DOI: 10.1088/0256-307X/33/2/028901
Ranking nodes by their spreading ability has been a fundamental issue related to many real applications, such as information and disease control. In the well-known coreness centrality measure, nodes' influence is ranked only by summing all neighbors' $k$-shell values while the effect of the topological connections among them on the nodes' spreading ability are ignored. In this work, we propose an improved coreness measure by decreasing the impact of densely local connections. Comparing the results from a series of susceptible-infected-recovered simulations on real networks, we show that our improved method can rank the nodes' spreading ability more accurately than other ranking measures such as $k$-shell, distance based method, mixed degree decomposition and coreness centrality method.
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37 articles
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