Mutually unbiased bases for the rotor degree of freedom

Details Mutually unbiased bases for the rotor degree of freedom Mutually unbiased bases for the rotor degree of freedom

2012-03-23

arxiv.org/abs/1203.5201v1

Physics

Quantum Physics

8 pages, 4 figures

Scientific paper

We consider the existence of a continuous set of mutually unbiased bases for the continuous and periodic degree of freedom that describes motion on a circle (rotor degree of freedom). By a singular mapping of the circle to the line, we find a first, but somewhat unsatisfactory, continuous set which does not relate to an underlying Heisenberg pair of complementary observables. Then, by a nonsingular mapping of the discrete angular momentum basis of the rotor onto the Fock basis for linear motion, we construct such a Heisenberg pair for the rotor and use it to obtain a second, fully satisfactory, set of mutually unbiased bases.

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