关键词: 量子纠缠/
内禀退相干/
初态/
Dzyaloshinskii-Moriya相互作用
English Abstract
Effects of Dzyaloshinskii-Moriya interacton and decoherence on entanglement dynamics in Heisenberg spin chain system with different initial states
Cong Mei-Yan1,2,Yang Jing1,2,
Huang Yan-Xia
1.College of Physics and Electronic Science, Hubei Normal University, Huangshi 435000, China;
2.Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Science, Hefei 230026, China
Fund Project:Project supported by the Major Research Plan of the National Natural Science Foundation of China(Grant No. 2012CB922100), and the Natural Science Foundation of Hubei Province, China(Grant No. 2011CDC010).Received Date:26 April 2016
Accepted Date:07 June 2016
Published Online:05 September 2016
Abstract:With considering the intrinsic decoherence, the dynamic behaviors of quantum entanglement in a three-qubit XXZ Heisenberg system with Dzyaloshinskii-Moriya (DM) interaction and anisotropy for different initial states are investigated. The research result shows that the anisotropy parameter does not affect the system entanglement, however, the intrinsic decoherence has obvious inhibitory effect on entanglement. When the initial state of system is an entangled state, we can obtain the stable value of entanglement by adjusting DM interaction parameters appropriately. As the system initial state is a separation state, entanglement oscillates, and the amplitude of oscillation decays with time periodically, and there will appear the death phenomenon after each oscillation, and with time going on, its concurrence will be zero. When the initial state is entangled, by choosing the proper DM parameter, the three pairs of entanglements oscillate with time and eventually approach to a steady value. The increase of accelerates the decay of concurrence. When the initial state is separated, entanglement oscillates, and the amplitude of oscillation decays with time periodically, and there will appear the death phenomenon after each oscillation, with time going on, its concurrence will be zero. Therefore, the proper initial state and DM interaction parameters can control the concurrence effectively under the intrinsic decoherence, thereby obtaining the preferable entanglement resource.
Keywords: quantum entanglement/
intrinsic decoherence/
initial state/
Dzyaloshinskii-Moriya interaction
