文档介绍：量子信息若干问题的研究
因为光子易于操作,传送速度快,而且传送过程中不易与环境发生相互作用,所
以线性光学系统也是实现量子信息操作的一种重要手段。基于目前的实验技术,
我们的方案在实验上是可以实现的。
(2). 在离子阱中实现最优对称性经济型态依靠量子克隆
由于离子阱系统用于量子信息处理过程,在最近取得一系列的进展,尤
其是阱中离子与光子的信息交换以及离子阱系统的可扩展性。多比特量子克隆无
论在量子信息理论还是应用上都有着重要的意义;离子阱在多原子操作上的进步
使得在离子阱中实现多比特量子克隆成为可能。基于此我们在离子阱系统中提出
了一个方案实现最优对称性13→经济型相位协变量子克隆和最优对称性13→
经济型实数态量子克隆。我们的方案有如下优点:,
因此称为经济型克隆并且对环境噪声不敏感。,这个特性
能帮我们将编码在初态的信息最佳分到最终系统。,其他一
系列量子克隆机如最佳对称性(非对称性)普适量子克隆,最佳对称性(非对称
性)12→相位协变量子克隆都能被实现。
关键词:量子隐形传态和密集编码,量子逻辑门,量子克隆。
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Abstract
Abstract
Quantum information science is a new field. It includes such two parts as quantum
computation and munication. prises
quantum teleportation, quantum dense coding, quantum secret sharing, quantum
cloning, etc. After the development of two decade years, people have acquired a series
of important breakthrough. It makes this subject e one of the hotspot in
international leading edge.
In recent years, puters have attracted much more attention because
they can show putational capacity than classical ones. As we know, the
quantum logical gates are one of the essential building blocks of a puter.
They play an important role in putation and munnication.
For puter, because of the no-cloning theorem and the linearity of the
Hilbert space, an arbitrary unknown quantum state is not copied exactly. Therefore
much more attention has been turned to approximate quantum cloning. In this paper,
we will study some problems of quantum information as quantum teleportation,
quantum dense coding, quantum logic gate and quantum cloning. The results of our
study are mainly given as follows,
1. The study of realizing quantum teleportation and dense coding in quantum cavity
QED
We propose a scheme to realize quantum teleportation and dense coding, in our
scheme, the atoms interact simultaneously with a highly detuned cavity mode with the
assistance of a classical field. In the whole