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arXiv 1604.00566quant-ph
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数与角的精确不确定关系

Sharp uncertainty relations for number and angle

Paul Busch, Jukka Kiukas, Reinhard F. Werner

摘要:

研究了数和角度等共轭变量对的不确定关系,其中一个取整数值,另一个取单位圆上的值。在任一变量中的问题的平移对称性意味着测量不确定性和制备不确定性在数量上一致,并且界限仅取决于用于量化数量和角度输出的差异的两个度量的选择。对于每一种类型的观察,我们讨论了两个自然的选择度量,并讨论了由此产生的最佳边界的数值和分析方法。我们还开发了一些简单而明确的(虽然不是尖锐的)下限,使用一个显然是新的方法获得认证的下限到基态问题。

英文摘要:

We study uncertainty relations for pairs of conjugate variables like number and angle, of which one takes integer values and the other takes values on the unit circle. The translation symmetry of the problem in either variable implies that measurement uncertainty and preparation uncertainty coincide quantitatively, and the bounds depend only on the choice of two metrics used to quantify the difference of number and angle outputs, respectively. For each type of observable we discuss two natural choices of metric, and discuss the resulting optimal bounds with both numerical and analytic methods. We also develop some simple and explicit (albeit not sharp) lower bounds, using an apparently new method for obtaining certified lower bounds to ground state problems.

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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