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arXiv 0910.4461quant-ph
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量子信号加速比的界

Bounds on the Speedup in Quantum signalling

Pablo Arrighi, Vincent Nesme, Reinhard Werner

摘要:

给定一个离散的可逆动力学,我们可以定义一个量子动力学,它像经典动力学一样作用于基态,但也允许它们的叠加。一个奇怪的事实是,在量子版本中,初始状态的局部变化,在一个单一的动力学步骤之后,有时可以检测到比经典更远的地方。在这里,我们表明,这种效应是没有用的产生更快的信号。在许多步骤的运行中,量子传播邻域只能增加一个恒定的条纹,所以速度没有渐近增加。

英文摘要:

Given a discrete reversible dynamics, we can define a quantum dynamics, which acts on basis states like the classical one, but also allows for superpositions of them. It is a curious fact that in the quantum version, local changes in the initial state, after a single dynamical step, can sometimes can be detected much farther away than classically. Here we show that this effect is no use for generating faster signals. In a run of many steps the quantum propagation neighborhood can only increase by a constant fringe, so there is no asymptotic increase in speed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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