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A scheme for teleporting a three-particle state is proposed when three pairs of entangled particles are used as quantum channels. Quantum teleportation can be successfully realized with a certain probability if the receiver adopts an appropriate unitary-reduction strategy. The probability of successful teleportation is determined by the smaller coetficients of the three entangled pairs. 相似文献
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研究了MMA-St在氧化还原引发剂KPS-CuSO_4-Na_2SO_3存在下的快速无皂乳液聚合.当[MMA]=0.51mol/L、[St]=0.49 mol/L、70℃对,在[KPS]=2.77×10~(-3)mol/L、[CuSO_4]=1.50×10~(-5)mol/L、[Na_2SO_3]=2.77×10~(-3) mol/L条件下反应100min,转化率大于90%;讨论了胶乳的分子量及其分布;求出了聚合反应活化能E_a=81.6 kJ/mol和聚合反应速率常数k_p=321.9 L/mol·s. 相似文献
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Within a quantum virial expansion, we investigate theoretically the violation of universal thermodynamics for a strongly interacting unitary Fermi gas trapped in a harmonic potential. The violation is caused by the existence and anisotropy of the trapping potential and a finite-range of the two-body interaction. We calculate the second virial coefficient by solving a two-fermion problem in 3D uniform harmonic traps, as well as in anisotropic traps. In the unitarity limit, the universal value of the trapped second virial coefficient is 1/4. We discuss in detail the non-universal correction to the second virial coefficient and to the equation of state. 相似文献
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A scheme for probabilistic controlled teleportation of a triplet W state from the sender Alice to the distant receiver Bob is proposed. In this scheme, an m-qubit GHZ state serves as the control parameter. The m control qubits are shared by m(s1, s2… sm) spatially-separated supervisors. With the aid of local operations and individual measurements, including Bell-state measurement, Von Neumann measurement, and mutual classical communication, etc., Bob can faithfully reconstruct the original state by performing relevant unitary transformations. However, even if one participant does not cooperate during the process, the receiver Bob cannot fully recover the original state. This protocol can be extended to probabilistic controlled teleportation of an arbitrary N-qubit state and some other N-qubit entangled states. 相似文献
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REN Jie ZHU Shi-Qun 《理论物理通讯》2008,49(6):1449-1452
The effects of anisotropy and magnetic field on multipartite entanglement of ground state in Heisenberg XY model are investigated. The multipartite entanglement increases as a function of the inverse strength of the external field when the degree of anisotropy is finite. There are two peaks when the degree of anisotropy is γ=±1. When the degree of anisotropy increases further, the multipartite entanglement will decrease and tend to a constant. The threshold of the inverse strength of the external field for generating multipartite entanglement generally decreases with the increasing of qubits. 相似文献
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玻色-爱因斯坦凝聚体中的超流现象 总被引:2,自引:0,他引:2
在玻色-爱因斯坦凝聚(BEC)的超流现象的研究中,人们通常采用平均场近似下求解Gross-Pitaveskii方程的方法,我们采用更严格的准确对角化的方法对弱排斥相互作用下两维旋转N-Boson体系的凝聚状态进行了研究,研究表明,弱相互作用下的基态并不是人们通常认为的单一凝聚态,而是一个碎裂凝聚态,通过碎裂态能谱与平均场方法给出的能谱之间的比较以及条件几率分布函数的计算,我们指出这种碎裂凝聚态有着内在的不稳定性,很容易破缺到一个单一凝聚状态;计算给出的条件几率分布可以用来揭示破缺石的状态,其分布图案与平均场近似下得到的涡旋图形相类似,我们进一步注意到过去研究工作主要集中在弱相互作用极限下和强相互作用Thomas-Fermi近似极限下这两种极端情况,为考察两种极限间的中间过渡区域,我们研究了中等相互作用强度下体系的基态性质。 相似文献