The maximally entangled symmetric state in terms of the geometric measure
Abstract
The geometric measure of entanglement is investigated for permutation symmetric pure states of multipartite qubit systems, in particular the question of maximum entanglement. This is done with the help of the Majorana representation, which maps an n qubit symmetric state to n points on the unit sphere. It is shown how symmetries of the point distribution can be exploited to simplify the calculation of entanglement and also help find the maximally entangled symmetric state. Using a combination of analytical and numerical results, the most entangled symmetric states for up to 12 qubits are explored and discussed. The optimization problem on the sphere presented here is then compared with two classical optimization problems on the S^{2} sphere, namely Tóth's problem and Thomson's problem, and it is observed that, in general, they are different problems.
 Publication:

New Journal of Physics
 Pub Date:
 July 2010
 DOI:
 10.1088/13672630/12/7/073025
 arXiv:
 arXiv:1003.5643
 Bibcode:
 2010NJPh...12g3025A
 Keywords:

 Quantum Physics
 EPrint:
 18 pages, 15 figures, small corrections and additions to contents and references