We present a brief review of discrete structures in a finite Hilbert space, relevant for the theory of quantum information. Unitary operator bases, mutually unbiased bases, Clifford group and stabilizer states, discrete Wigner function, symmetric informationally complete measurements, projective and unitary t--designs are discussed. Some recent results in the field are covered and several important open questions are formulated. We advocate a geometric approach to the subject and emphasize numerous links to various mathematical problems.
- Pub Date:
- January 2017
- Quantum Physics;
- Mathematical Physics
- 30 pages with 5 figures. Preprint based on a new chapter written to the second edition of the book "Geometry of Quantum States. An introduction to Quantum Entanglement", CUP, Cambridge, to appear in 2017