Bell states, mutually unbiased bases and the Mean King's problem

Details Bell states, mutually unbiased bases and the Mean King's problem Bell states, mutually unbiased bases and the Mean King's problem

2004-01-08

arxiv.org/abs/quant-ph/0401037v2

Physics

Quantum Physics

Original paper replaced in June 2005 for the following reason: new material added (connections with Aravind's general solution

Scientific paper

When the state of a quantum system belongs to a N-dimensional Hilbert space, with N the power of a prime number, it is possible to associate to the system a finite field (Galois field) with N elements. In this paper, we introduce generalized Bell states that can be intrinsically expressed in terms of the field operations.These Bell states are in one to one correspondence with the N^2 elements of the generalised Pauli group or Heisenberg-Weyl group. This group consists of discrete displacement operators and provides a discrete realisation of the Weyl function.Thanks to the properties of generalised Bell states and of quadratic extensions of finite fields, we derive a particular solution for the Mean King's problem. This solution is in turn shown to be in one to one correspondence with a set of N^2 self-adjoint operators that provides a discrete realisation of the Wigner quasi-distribution.

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