Entanglement of degenerate ground state for spin 1 and 1/2 pair

Details Entanglement of degenerate ground state for spin 1 and 1/2 pair Entanglement of degenerate ground state for spin 1 and 1/2 pair

2004-08-25

arxiv.org/abs/quant-ph/0408155v2

Physics

Quantum Physics

5 pages, 4 figures; one figure is replaced and one subsection is revised

Scientific paper

We study the entanglement feature of the ground state of a system composed of spin 1 and 1/2 parts. The concurrence vector is shown to be consistent with the measurement of von Neumann entropy for such system. In the light of the ground state degeneracy, we suggest a average concurrence to measure the entanglement of Hilbert subspace. The entanglement property of both a general superposition as well as the mixture of the degenerate ground states are discussed by means of average concurrence and the negativity respectively.

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