Representation of SO(3) Group by a Maximally Entangled State

Details Representation of SO(3) Group by a Maximally Entangled State Representation of SO(3) Group by a Maximally Entangled State

2004-03-13

arxiv.org/abs/quant-ph/0403099v1

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevA.69.064301

A representation of the SO(3) group is mapped into a maximally entangled two qubit state according to literatures. To show the evolution of the entangled state, a model is set up on an maximally entangled electron pair, two electrons of which pass independently through a rotating magnetic field. It is found that the evolution path of the entangled state in the SO(3) sphere breaks an odd or even number of times, corresponding to the double connectedness of the SO(3) group. An odd number of breaks leads to an additional $\pi$ phase to the entangled state, but an even number of breaks does not. A scheme to trace the evolution of the entangled state is proposed by means of entangled photon pairs and Kerr medium, allowing observation of the additional $\pi$ phase.

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