局部纠缠交换对量子随机网络鲁棒性的影响

利用纠缠渗流的方法，在量子随机网络中任意两个节点间建立远距离纠缠态，同时还进行了局部纠缠交换的操作。通过此操作改变了网络中局部节点间的连接情况，也使整个网络的拓扑结构发生变化。重点探讨了局部操作对量子随机网络鲁棒性的影响，这种影响通过纠缠渗流的阈值变化情况来体现。通过理论分析和数值模拟，发现有操作时度大的节点数目明显增多，遭受随机攻击后的阈值变化也较小。这说明进行局部纠缠交换操作能够大幅度提高量子网络受到攻击后的连接鲁棒性。     

On the power of non-local boxes

A non-local box is a virtual device that has the following property: given that Alice inputs a bit at her end of the device and that Bob does likewise, it produces two bits, one at Alice's end and one at Bob's end, such that the XOR of the outputs is equal to the AND of the inputs. This box, inspired from the CHSH inequality, was first proposed by Popescu and Rohrlich to examine the question: given that a maximally entangled pair of qubits is non-local, why is it not maximally non-local? We believe that understanding the power of this box will yield insight into the non-locality of quantum mechanics. It was shown recently by Cerf, Gisin, Massar and Popescu, that this imaginary device is able to simulate correlations from any measurement on a singlet state. Here, we show that the non-local box can in fact do much more: through the simulation of the magic square pseudo-telepathy game and the Mermin-GHZ pseudo-telepathy game, we show that the non-local box can simulate quantum correlations that no entangled pair of qubits can, in a bipartite scenario and even in a multi-party scenario. Finally we show that a single non-local box cannot simulate all quantum correlations and propose a generalization for a multi-party non-local box. In particular, we show quantum correlations whose simulation requires an exponential amount of non-local boxes, in the number of maximally entangled qubit pairs.     

Perspectives on solid-state flying qubits

We review recent efforts toward the numerical modeling of prototypes of one- and two-qubit gates based on coherent electron transport in semiconductor quantum wires. The basics of the proposed devices are presented and a theoretical approach aimed at quantifying the decoherence induced by electron-electron coupling is described.     

Role of the Amorphous Morphology in Physical Properties of Ultra High Molecular Weight Polyethylene

The role of amorphous layer in the physical properties of ultra high molecular weight polyethylene (UHMWPE) was investigated. It revealed that the thicker amorphous layer would promote the toughness of polyethylene, but make a negative effect on the rigidity of the polymer. Furthermore, it would be easier for semicrystalline polymers with less entangled chains to bring out the interlamellar slippage that would absorb more energy during the deformation. Finally, promotion of the physical properties of UHMWPE was also achieved with the assistant of nano-modification and an excellent relativity between the physical properties and the amorphous thickness (la) was obtained.     

Nuclear polarization and entanglement in spin systems

We investigated relationships between entanglement measures and the order parameter (nuclear polarization) in nuclear spin systems controlled by the nuclear magnetic resonance (NMR) technique. Since spin polarization can be easily manipulated by the NMR technique, experimentalists are presented with an opportunity to study the dynamic properties of entanglement, i.e., the creation and evolution of entangled states. Our approach may constitute the basis for researching the relations between the entanglement measures and measurable parameters of order in other quantum systems. An erratum to this article can be found at     

Viscoelastic behavior of fullerene end-capped linear polymers

Viscoelastic behavior of C₆₀-end-capped linear polybutadiene and C₆₀-end-capped poly(butadiene-co-styrene) with molecular weight (M_n) ranging from 30 to 130 kg/mol and with polydispersity index (M_w/M_n) ranging from 1.02 to 1.08 was investigated. These polymers were synthesized through anionic polymerization of butadiene and styrene in hexane, in which the living ends were capped with the C₆₀ via an alcoholate bridging. Rheological measurements showed that the polymer dynamics in the terminal zone were profoundly affected by the presence of fullerene, while the dynamics in the entanglement-plateau and at the terminal relaxation were nearly unaffected.     

蒸汽加固非织造技术及应用

介绍了蒸汽加固非织造技术的作用机理、机构原理、工艺流程、产品性能和相关技术优势。蒸汽加固技术是一种依靠机械缠结力和热熔粘结作用双重加固的新型非织造技术。     

Effects of scattering resonances on carrier-carrier entanglement in charged quantum dots

We address the problem of the entanglement generation in an electron-scattering by a 1D double-barrier resonant tunnelling device. In particular we analyze the role played by transport resonances in the appearance of quantum correlations between the energy states of the electrons. The entanglement is not sensitive to the presence of Breit-Wigner resonances, while it may be controlled by manipulating Fano resonances. Such a behavior is ascribed to the different mechanisms characterizing the two types of processes.     

Quantum Entanglement and Cryptography for Automation and Control of Dynamic Systems

This paper addresses the application of quantum entanglement and cryptography for automation and control of dynamic systems.A dynamic system is a system where t...     

振动力场下聚合物熔体缠结密度理论研究

本文对Liu(1981)提出的动态速率方程加以修正 ,用修正的速率方程来研究振动剪切场下缠结密度的变化情况 ,指出当施加正统应变后 ,缠结密度的变化也呈周期性变化 ,而且施加的应变振幅与频率的大小对缠结密度的变化有很大影响 ,当施加的应变振幅或频率越大时 ,缠结密度变化的幅度越大 ,从而使熔体的粘度变化也越大。同时指出施加振动可以减少链段和整个分子链的松弛时间 ,而且初始平衡态时的平均缠结点数越少 ,施加振动后的缠结密度变化幅度越大