2008/07/31 by Chuan-Jia Shan, Shan Chuan-Jia, Cheng Wei-Wen +6 · 21 citations
Computer Science · Physics and Astronomy · #Concurrence #Condensed matter physics #Ferromagnetism #Heisenberg model #Physics #Population #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum and electron transport phenomena #Quantum decoherence #Quantum entanglement #Quantum mechanics #Qubit #Spin (aerodynamics) #Sudden death #quant-ph
paper · pdf · doi:10.1088/0256-307x/25/9/006
published in Chinese Physics Letters 25(9), 3115-3118 (Institute of Physics) · 11 pages, 4 figures
arxiv created 2008/08/31 · openalex publication_date 2008/09/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Taking the decoherence effect due to population relaxation into account, we investigate the entanglement properties for two qubits in the Heisenberg XY interaction and subject to an external magnetic Geld. It is found that the phenomenon of entanglement sudden death (ESD) as well as sudden birth (ESB) appear during the evolution process for particular initial states. The influence of the external magnetic Geld and the spin environment on ESD and ESB are addressed in detail. It is shown that the concurrence, a measure of entanglement, can be controlled by tuning the parameters of the spin chain, such as the anisotropic parameter, external magnetic Geld, and the coupling strength with their environment. In particular, we Gnd that a critical anisotropy constant exists, above which ESB vanishes while ESD appears. It is also notable that stable entanglement, which is independent of different initial states of the qubits, occurs even in the presence of decoherence.