Projective Ring Line of a Specific Qudit

Details Projective Ring Line of a Specific Qudit Projective Ring Line of a Specific Qudit

2007-08-31

arxiv.org/abs/0708.4333v2

Journal of Physics A Mathematical and Theoretical 40 (2007) F943-F952

Physics

Quantum Physics

Scientific paper

10.1088/1751-8113/40/43/F03

A very particular connection between the commutation relations of the elements of the generalized Pauli group of a $d$-dimensional qudit, $d$ being a product of distinct primes, and the structure of the projective line over the (modular) ring $\bZ_{d}$ is established, where the integer exponents of the generating shift ($X$) and clock ($Z$) operators are associated with submodules of $\bZ^{2}_{d}$. Under this correspondence, the set of operators commuting with a given one -- a perp-set -- represents a $\bZ_{d}$-submodule of $\bZ^{2}_{d}$. A crucial novel feature here is that the operators are also represented by {\it non}-admissible pairs of $\bZ^{2}_{d}$. This additional degree of freedom makes it possible to view any perp-set as a {\it set-theoretic} union of the corresponding points of the associated projective line.

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