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Geometric phase for degenerate states of spin-1 and spin-1/2 pair

100%

Zhu G.-Q.

Open Physics

2007

tom 5

nr 4

463-470

The geometric phase of a bi-particle model is discussed. One can drive the system to evolve by applying an external magnetic field, thereby controlling the geometric phase. The model has degenerate lowest-energy eigenvectors. The initial state is assumed to be the linear superposition or mixture of the eigenvectors. The relationship between the geometric phase and the structures of the initial state is considered, and the results are extended to a more general model.

Average entanglement of spin 1 and 1/2 pair

100%

Zhu G.-Q.

Open Physics

2009

tom 7

nr 1

135-140

We study the entanglement features of the ground state of a system composed of spin 1 and 1/2 parts. In the light of the ground state degeneracy, the notion of average entanglement is used to measure the entanglement of the Hilbert subspace. The entanglement properties of both a general superposition as well as the mixture of the degenerate ground states are discussed by means of average entanglement and the negativity respectively.

Electron-nuclear entanglement in the cold lithium gases

51%

Zhu G.-Q. , Mao J.-W. , Li Y.-Q.

Open Physics

2005

tom 3

nr 4

536-542

We study the ground-state entanglement and thermal entanglement in the hyperfine interaction of the lithium atom. We present the relationship between the entanglement and both temperature and external magnetic fields.