Quantum entanglement analysis of an optically excited coupling of two nuclear spins via a mediator: Combining the quantum concurrence and negativity

• Published in: Physica. E, Low-dimensional systems & nanostructures Vol. 97; pp. 45 - 51
• Main Authors: Fu, Chenghua, Hu, Zhanning
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2018
• Subjects: Concurrence; Negativity; Optically excited entanglement; Two nuclear spins; Negativity; Concurrence; Optically excited entanglement; Two nuclear spins
• ISSN: 1386-9477; 1873-1759
• DOI: 10.1016/j.physe.2017.10.008

In this paper, we investigate the characteristics of the nuclear spin entanglement generated by an intermedium with an optically excited triplet. Significantly, the interaction between the two nuclear spins presents to be a direct XY coupling in each of the effective subspace Hamiltonians which are obtained by applying a transformation on the natural Hamiltonian. The quantum concurrence and negativity are discussed to quantitatively describe the quantum entanglement, and a comparison between them can reveal the nature of their relationship. An innovative general equation describing the relationship between the concurrence and negativity is explicitly obtained. •We investigate the entanglement characteristics of the nuclear spin entanglement generated by an intermedium with an optically excited triplet.•We discuss the quantum concurrence and negativity to quantitatively describe the quantum entanglement.•We derive an innovative general equation describing the relationship between the concurrence and negativity.