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arXiv 1209.0362quant-ph
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物理过程的量子速度极限

Quantum speed limit for physical processes

M. M. Taddei, B. M. Escher, L. Davidovich, R. L. de Matos Filho

摘要:

计算系统两个可区分状态之间的最小演化时间对于评估量子计算机和通信信道的最大速度非常重要。这个最小时间的下限已经被提出用于酉动力学。在这里,我们表明,它是可能的,以扩展这一概念的非幺正过程,使用可达到的下限,连接到时间估计的量子费舍尔信息。该结果用于界定典型噪声信道的最小演化时间。

英文摘要:

The evaluation of the minimal evolution time between two distinguishable states of a system is important for assessing the maximal speed of quantum computers and communication channels. Lower bounds for this minimal time have been proposed for unitary dynamics. Here we show that it is possible to extend this concept to nonunitary processes, using an attainable lower bound that is connected to the quantum Fisher information for time estimation. This result is used to delimit the minimal evolution time for typical noisy channels.

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