arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.01244hep-thcs.ITmath.COmath.ITquant-ph
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量子稳定子码、格和CFTs

Quantum stabilizer codes, lattices, and CFTs

Anatoly Dymarsky, Alfred Shapere

摘要:

经典纠错码、欧几里得格和手征共形场论之间有着丰富的联系。在这里,我们表明,量子纠错码,那些稳定剂类型,与洛伦兹晶格和非手征CFTs。更具体地说,实自对偶稳定子码可以与偶自对偶洛伦兹晶格相关联,从而定义纳拉因CFTs。我们称之为编码的CFTs理论和研究他们的属性。代码CFT的T-对偶变换,在底层代码的水平上,减少到代码等价。通过这种等价,任何稳定器代码都可以简化为图形代码。因此,我们可以用图来表示代码的CFTs。我们研究了带有小中心荷$c=n\leq 12$的编码CFTs,发现了许多有趣的例子。其中之一是非手性$E_8$理论,其基于被理解为偶自对偶洛伦兹晶格的$E_8$的根晶格。通过分析所有具有$n\leq 8$节点的图,我们发现了许多物理上不同的等谱理论对和三重。我们还构造了许多模块化不变函数,满足CFT配分函数的所有基本性质,但这不是任何已知的CFT的配分函数。我们考虑所有码理论的系综平均,计算相应的配分函数,并讨论其可能的全息解释。该文件是写在一个独立的方式,包括广泛的教学介绍和许多明确的例子。

英文摘要:

There is a rich connection between classical error-correcting codes, Euclidean lattices, and chiral conformal field theories. Here we show that quantum error-correcting codes, those of the stabilizer type, are related to Lorentzian lattices and non-chiral CFTs. More specifically, real self-dual stabilizer codes can be associated with even self-dual Lorentzian lattices, and thus define Narain CFTs. We dub the resulting theories code CFTs and study their properties. T-duality transformations of a code CFT, at the level of the underlying code, reduce to code equivalences. By means of such equivalences, any stabilizer code can be reduced to a graph code. We can therefore represent code CFTs by graphs. We study code CFTs with small central charge $c=n\leq 12$, and find many interesting examples. Among them is a non-chiral $E_8$ theory, which is based on the root lattice of $E_8$ understood as an even self-dual Lorentzian lattice. By analyzing all graphs with $n\leq 8$ nodes we find many pairs and triples of physically distinct isospectral theories. We also construct numerous modular invariant functions satisfying all the basic properties expected of the CFT partition function, yet which are not partition functions of any known CFTs. We consider the ensemble average over all code theories, calculate the corresponding partition function, and discuss its possible holographic interpretation. The paper is written in a self-contained manner, and includes an extensive pedagogical introduction and many explicit examples.

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