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arXiv quant-ph/0406127quant-ph
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线性光网络中的永久器件

Permanents in linear optical networks

Stefan Scheel

摘要:

我们开发了一个抽象的线性光网络从组合学和持久的观点。特别是,我们表明,计算矩阵元素的酉变换光子多模状态是密切相关的永久的计算。这一显著事实的一个含义是,所有基于评估矩阵元素的计算通常在计算上是困难的。此外,量子力学提供了某些矩阵分析结果的更简单的推导,我们通过证明任何酉矩阵的永久式在复平面中的单位圆盘上取其值来验证这些结果。

英文摘要:

We develop an abstract look at linear optical networks from the viewpoint of combinatorics and permanents. In particular we show that calculation of matrix elements of unitarily transformed photonic multi-mode states is intimately linked to the computation of permanents. An implication of this remarkable fact is that all calculations that are based on evaluating matrix elements are generically computationally hard. Moreover, quantum mechanics provides simpler derivations of certain matrix analysis results which we exemplify by showing that the permanent of any unitary matrix takes its values across the unit disk in the complex plane.

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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