Generating Ray Class Fields of Real Quadratic Fields via Complex Equiangular Lines
Abstract
For certain real quadratic fields $K$ with sufficiently small discriminant we produce explicit unit generators for specific ray class fields of $K$ using a numerical method that arose in the study of complete sets of equiangular lines in $\mathbb{C}^d$ (known in quantum information as symmetric informationally complete measurements or SICs). The construction in low dimensions suggests a general recipe for producing unit generators in infinite towers of ray class fields above arbitrary real quadratic $K$, and we summarise this in a conjecture. There are indications [19,20] that the logarithms of these canonical units are related to the values of $L$functions associated to the extensions, following the programme laid out in the Stark Conjectures.
 Publication:

arXiv eprints
 Pub Date:
 April 2016
 arXiv:
 arXiv:1604.06098
 Bibcode:
 2016arXiv160406098A
 Keywords:

 Mathematics  Number Theory;
 Quantum Physics
 EPrint:
 21 pages. v3 is published version to appear in Acta Arithmetica