The isotropic lines of Z_{d}^{2}

Abstract

We show that the isotropic lines in the lattice Z_{d}^{2} are the Lagrangian submodules of that lattice and we give their number together with the number of them through a given point of the lattice. The set of isotropic lines decompose into orbits under the action of SL(2,Z_d). We give an explicit description of those orbits as well as their number and their respective cardinalities. We also develop two group actions on the group Σ_{D}(M) related to the topic.

10 pages

References in corpus (5)

• A new proof for the existence of mutually unbiased bases
• Discrete phase space based on finite fields
• Projective Ring Line of an Arbitrary Single Qudit
• Projective Ring Line of a Specific Qudit
• Matrix reduction and Lagrangian submodules

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