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arXiv quant-ph/0202053quant-ph
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大多数贝尔操作员不会严重违反局部性

Most Bell Operators do not Significantly Violate Locality

Itamar Pitowsky

摘要:

$n$ qbits的贝尔不等式的最严重违反是大小为$2^{\frac{n-1}{2}}$,并且它是由作用于特定状态的特定运算符获得的。相反,我们表明,对于绝大多数贝尔运营商的最坏的违反是有界的$O((n\log n)^{1/2})$,低于实验检测。对于Werner和Wolf [Phys. Rev. A 64,032112(2001)]提出的极值算子,我们证明了它们中的大多数具有由$O(n^{1/2})$限定的范数。

英文摘要:

The worst violation of Bell's inequality for $n$ qbits is of size $2^{\frac{n-1}{2}}$ and it is obtained by a specific operator acting on a specific state. We show, to the contrary, that for a vast majority of Bell operators the worst violation is bounded by $O((n\log n)^{1/2})$, below experimental detection. With respect to the extremal operators, introduced by Werner and Wolf [Phys. Rev. A 64, 032112 (2001)], we show that a large majority of them have a norm bounded by $O(n^{1/2})$.

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