arXiv 0711.45382007-11quant-ph

关于比light quantum通信更快的最新提议

On a recent proposal of faster than light quantum communication

A. Bassi, G. C. Ghirardi

备注：: 9 pages, LaTeX. Minor changes made
发表信息：: Int. Journ. Theor. Phys. 47, 2500 (2008).
DOI：: 10.1007/s10773-008-9683-4

摘要：

在最近的一篇论文中，A.Y. Shiekh讨论了一种实验装置，在他看来，这种装置应该可以利用量子波函数的坍缩实现超光速通信。与过去提出的许多建议相反，他没有采用两个系统的纠缠态，而是用一个粒子在两个状态的叠加中工作-对应于它在相反方向上的传播-其中一个通过适当的干涉仪。干涉仪附近的观察者可以自由选择是否沿其中一条路径引入移相器，这就可以瞬间改变在对应于另一种叠加态的远处区域找到粒子的概率，并相应地改变到达远处观察者的粒子束的强度。在本文中，我们指出一个缺陷的论点：再次，因为它已被证明在充分的一般性很久以前，波包减少的过程不能用于超光速通信。

英文摘要：

In a recent paper, A.Y. Shiekh has discussed an experimental set-up which, in his opinion, should make possible faster-than-light communication using the collapse of the quantum wave function. Contrary to the many proposals which have been presented in the past, he does not resort to an entangled state of two systems but he works with a single particle in a superposition of two states - corresponding to its propagation in opposite directions - one of which goes through an appropriate interferometer. The possibility for an observer near the interferometer to introduce or not, at his free will, a phase shifter along one of the paths should allow to change instantaneously the probability of finding the particle in the far-away region corresponding to the other state of the superposition and, correspondingly, to change the intensity of a beam of particles reaching a distant observer. In this paper we show a flaw in the argument: once more, as it has been proved in full generality a long time ago, the process of wave packet reduction cannot be used for superluminal communication.

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