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71.
本文在分析了目前有关线性规划“悖论”的论述后,运用灵敏度分析的方法和影子价格的理论,对所谓线性规划的悖论问题作了新的解释,提出了“悖论””不悖、其实是在情理之中的新观点。并对悖论产生的条件提出了简便易行的计算公式。 相似文献
72.
M. A. Jafarizadeh G. Najarbashi Y. Akbari H. Habibian 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2008,47(2):233-255
One of the problems concerning entanglement witnesses (EWs) is the
construction of them by a given set of operators. Here several
multi-qubit EWs called stabilizer EWs are constructed by using the
stabilizer operators of some given multi-qubit states such as GHZ,
cluster and exceptional states. The general approach to manipulate
the multi-qubit stabilizer EWs by exact(approximate) linear
programming (LP) method is described and it is shown that the
Clifford group play a crucial role in finding the hyper-planes
encircling the feasible region. The optimality, decomposability and
non-decomposability of constructed stabilizer EWs are discussed. 相似文献
74.
C.-S. Yu H.-S. Song 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2007,42(1):147-151
In this paper, an intuitive approach is employed to
generalize the full separability criterion of tripartite quantum
states of qubits to the higher-dimensional systems [Phys. Rev. A
72, 022333 (2005)]. A distinct characteristic of the
present generalization is that less restrictive conditions are
needed to characterize the properties of full separability.
Furthermore, the formulation for pure states can be conveniently
extended to the case of mixed states by utilizing the Kronecker
product approximate technique. As applications, we give the analytic
approximation of the criterion for weakly mixed tripartite quantum
states and investigate the full separability of some weakly mixed
states. 相似文献
75.
X. Hao S. Zhu 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2007,41(1):199-203
The two atoms in the ion trap are entangled by the interaction
with an external excited atom. The evolution of the entanglement
is analytically derived without the decoherence. Considering the
spontaneous decay from the environment, the evolution of the
entanglement is similar to the damping Rabi oscillation. The
generation of entanglement is induced by the dipole-dipole type
interaction of atoms. It is found that the entanglement of two
trapped atoms is robust with the uniform interaction with the
external atom. The collective spontaneous emission from the
coupling between the atoms may enhance the entanglement. 相似文献
76.
评述了在高能物理中检验量子力学的完备性, 特别是检验Bell不等式的研究工作进展情况, 简略地介绍了Einstain, Podolsky和Rosen (EPR)佯谬及其相应的光子实验得到的结果. 概括地阐述了在高能物理中早期利用粒子衰变中的自旋关联以及后来用中性介子的混合形成的准自旋纠缠态检验Bell不等式的各种尝试, 给出了K0和B0系统的相关实验结果. 介绍了一种可在φ工厂中实施实验检验的, 基于非最大纠缠态的新的方案. 最后还讨论了把这一实验方案推广到τ-粲工厂的可能性. 相似文献
77.
Engineering entanglement of a general three-level system interacting with a correlated two-mode nonlinear coherent state 总被引:2,自引:0,他引:2
Mahmoud Abdel-Aty Abdel-Shafy F. Obada 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2003,23(1):155-165
In this article a treatment of a three-level atom interacting with two modes of light in a cavity with arbitrary forms of
nonlinearities of both the fields and the intensity-dependent atom-field coupling is presented. A factorization of the initial
density operator is assumed, with the privileged field modes being in a pair-coherent state. We derive and illustrate an exact
expression for the time evolution of the density operator, by means of which we identify and numerically demonstrate the region
of parameters where significantly large entanglement can be obtained. We show that entanglement can be significantly influenced
by different kinds of nonlinearities. The nonlinear medium yields the superstructure of atomic Rabi oscillation. We propose
a generation of Bell-type states having a simple initial state preparation of the present system.
Received 29 July 2002 / Received in final form 18 October 2002 Published online 21 January 2003
RID="a"
ID="a"e-mail: abdelaty@uni-flensburg.dePresent address: Institut für Mathematik, Universit?t Flensburg, Germany. 相似文献
78.
Quantum Zeno and anti-Zeno paradoxes 总被引:1,自引:0,他引:1
Continuous observation of a time independent projection operator is known to prevent change of state (the quantum Zeno paradox).
We discuss the recent result that generic continuous measurement of time dependent projection operators will in fact ensure
change of state: an anti-Zeno paradox. 相似文献
79.
The solution of the time-dependent Fokker--Planck equation of non-degenerate optical parametric amplification and its application to the optimum realization of EPR paradox
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In this paper, the solution of the time-dependent Fokker--Planck
equation of non-degenerate optical parametric amplification is
used to deduce the condition demonstrating the
Einstein--Podolsky--Rosen (EPR) paradox. The analytics and
numerical calculation show the influence of pump depletion on
the error in the measurement of continuous variables. The
optimum realization of EPR paradox can be achieved by adjusting
the parameter of squeezing. This result is of practical
importance when the realistic experimental conditions are taken
into consideration. 相似文献
80.