基于纠缠关系的变精度优势关系粗糙集模型

针对优势关系粗糙集(Dominance-based Rough Set Approach, DRSA)理论经典模型中,下近似过于严苛和不一致对象对模型的影响问题,提出一种基于纠缠关系的DRSA模型。利用纠缠关系将属性相似、功能近似的对象进行整合,构建复杂的对象实体,其特点是充分考虑了不能进入优势集和劣势集元素对当前样本的影响,同时建立纠缠域区分不同元素对求解下近似的影响,将仅在统计上对求解产生影响但实际联系不紧密的元素排除,从而达到去除该部分包含的不一致对象的目的。

修白新世纪的中短篇小说管论

修白是当代文坛能以比较清醒的姿态坚守中短篇小说创作阵地的作家之一。新世纪以来,修白在观察着时代变迁与社会生活的同时从中发现问题,努力在艺术形象的性格内涵以及人与社会、人与人的关系纠缠中让人物体验与探索生存真相与人性之恶,并由此直抵当代人心文化深层结构的人生形态。更为重要的是,她不仅以审视"恶"来遏止"恶",而且还借助自我内省与忏悔、心灵净化与修复人性的尊严等,来实现当代人的自我救赎。修白小说多变的叙事方式与灵动的深刻寓象,值得研究者和读者继续期待她带来更多更大的惊喜。

Quantum Mechanical Correspondence of Poisson Integral Formula

In this paper we set up quantum mechanical correspondence of the Poisson integral formula.We show that Poisson kernel function existing in the transformation between the continuum entangled state representation and its induced state,i.e.the number-difference-correlated amplitude entangled state representation.

Generation of Atomic Greenberger-Horne-Zeilinger States Based on Faraday Rotation

Based on the input-output relation of the cavity and the Faraday Rotation mechanism, we propose a scheme for generating the n-atom Greenberger Horne-Zeilinger state. In the scheme, the n-atom trapped respectively in n spatially separate cavities would be entangled with the photons going through the atom-cavity system. The successful probabilities of our protocol approach unity in the ideal case. What is more, no requirement for separately addressing further lowers experimental difficulties.

Existence of Bond-Order-Wave Phase in One-Dimensional Extended Hubbard Model

By using the density matrix renormalization group technique, the phase diagram of the half-tilting extended Hubbard model is investigated. The conventional order parameter, the two-site entanglement entropy, and the block- block entanglement entropy are analyzed in detail. According to the numerical results, in the weak coupling region, an intermediate bond-order-wave （BOW） phase is shown to exist indeed between the charge-density-wave （CDW） and the spin-density-wave （SDW） phases. The critical phase transition points are determined by the singularity of the first order derivative of two-site entanglement entropy. In strong coupling region, a direct phase transition occurs from SDW phase to CDW phase, and shows discontinuous （first order） character accompanied with energy level crossing. The numerical results support the phase diagram proposed previously by some authors Sengupta et al., （2002）; Sandvik et al., （2004）; Zhang, （2004）. Therefore, the quantum entanglement is a sensitive tool to describe quantum phase transitions in strongly correlated electron systems.

Entanglement and discord assisted entropic uncertainty relations under decoherence

The uncertainty principle is a crucial aspect of quantum mechanics.It has been shown that quantum entanglement as well as more general notions of correlations,such as quantum discord,can relax or tighten the entropic uncertainty relation in the presence of an ancillary system.We explored the behaviour of entropic uncertainty relations for system of two qubits—one of which subjects to several forms of independent quantum noise,in both Markovian and non-Markovian regimes.The uncertainties and their lower bounds,identified by the entropic uncertainty relations,increase under independent local unital Markovian noisy channels,but they may decrease under non-unital channels.The behaviour of the uncertainties(and lower bounds)exhibit periodical oscillations due to correlation dynamics under independent non-Markovian reservoirs.In addition,we compare different entropic uncertainty relations in several special cases and find that discord-tightened entropic uncertainty relations offer in general a better estimate of the uncertainties in play.

Quantum Measurement of Two-Qubit System in Damping Noise Environment

It is known that the inevitable interaction of the entangled qubits with their environments may result in the degradation of quantum correlation.We study the decoherence of two remote qubits under general local single-and two-sided amplitude-damping channel(ADC).By using concurrence,quantum discord and Clauser-Horne-ShimonyHolt(CHSH)inequality,we find that the relation between the residual quantum correlations and the initial ones are different.Recently,Wang et al.[Int.J.Theor.Phys.54(2015)5]showed that there exist a set of partially entangled states that are more robust than maximally entangled states in terms of the residual quantum correlation measured by concurrence,fully entangled fraction and quantum discord,respectively.Here we find that both in single-and two-sided ADC,only the evolution of CHSH inequality with the initial parameter is proportional to that of the initial nonlocality.That means the initial state with maximally nonlocality will retain its role in the evolution.It implies that the evolution of nonlocality may reveal the characteristics of quantum state better.Furthermore,we discuss the evolutions of the three different quantum measurements with the initial parameter under generalized amplitude damping channel(GADC)and find that they are all proportional to that of the initial state.

Entanglement,Identical Particles and the Uncertainty Principle

A new uncertainty relation(UR) is obtained for a system of N identical pure entangled particles if we use symmetrized observables when deriving the inequality. This new expression can be written in a form where we identify a term which explicitly shows the quantum correlations among the particles that constitute the system. For the particular cases of two and three particles, making use of the Schwarz inequality, we obtain new lower bounds for the UR that are different from the standard one.