线上的量子游走：纠缠与非局域初始条件
量子物理
2009-11-11 v5
摘要
量子游走演化算符中的条件位移在硬币自由度与位置自由度之间产生纠缠。该纠缠可由约化密度算符的冯·诺依曼熵（纠缠熵）来量化。在长时间极限下，它收敛到一个依赖于初始态的明确值。对于（i）局域初始条件以及（ii）由 +1 和 -1 位置本征态张成的位置子空间中的初始条件，获得了渐近（长时间）纠缠的精确表达式。
引用
@article{arxiv.quant-ph/0507264,
title = {Quantum walk on the line: entanglement and non-local initial conditions},
author = {G. Abal and R. Siri and A. Romanelli and R. Donangelo},
journal= {arXiv preprint arXiv:quant-ph/0507264},
year = {2009}
}
备注
A few mistakes where corrected. One of them leads to a factor of 2 in eq. (49), the other results remain unchanged. In this version, several figures where replaced by color versions