A notable relation between N -qubit and 2N-1qubit pauli groups via binary LGr(N, 2N)

Frédéric Holweck, Metod Saniga, Péter Lévay

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5 Citations (Scopus)


Employing the fact that the geometry of the N -qubit (N ≥ 2) Pauli group is embodied in the structure of the symplectic polar space W(2N - 1, 2) and using properties of the Lagrangian Grassmannian LGr(N, 2N) defined over the smallest Galois field, it is demonstrated that there exists a bijection between the set of maximum sets of mutually commuting elements of the N -qubit Pauli group and a certain subset of elements of the 2N - 1qubit Pauli group. In order to reveal finer traits of this correspondence, the cases N = 3 (also addressed recently by Lévay, Planat and Saniga [J. High Energy Phys. 2013 (2013), no. 9, 037, 35 pages]) and N = 4 are discussed in detail. As an apt application of our findings, we use the stratification of the ambient projective space PG(2N - 1, 2) of the 2N - 1-qubit Pauli group in terms of G-orbits, where G ≡ SL(2, 2) × SL(2, 2) × · · · × SL(2, 2) ⋊ SN, to decompose π(LGr(N, 2N)) into non-equivalent orbits. This leads to a partition of LGr(N, 2N) into distinguished classes that can be labeled by elements of the above-mentioned Pauli groups.

Original languageEnglish
Article number041
JournalSymmetry, Integrability and Geometry: Methods and Applications (SIGMA)
Publication statusPublished - Apr 8 2014



  • Lagrangian Grassmannians LGr(N,2N) over the smallest Galois field
  • Multi-qubit Pauli groups
  • Symplectic polar spaces W(2N - 1,2)

ASJC Scopus subject areas

  • Analysis
  • Mathematical Physics
  • Geometry and Topology

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