Disentanglement and Decoherence in the Three-qubit System
Ming‐Liang Hu · ACTA PHOTONICA SINICA · 2008
The disentanglement and decoherence in the three-qubit system are studied based on the model of reservoir of harmonic oscillators by solving the non-Markovian approximation master equation,in which they are caused by a pure dephasing process.The GHZ-class state,W-class state and WGHZ-class state are discussed in detail.In all cases,the time scales of the decoherence and disentanglement are obtained.For the initial GHZ-class state,the coherence and entanglement decay completely;for the initial W-class state,the decoherence and disentanglement do not occur;for the initial WGHZ-class state,the decoherence happens partly,and the entanglement varies with time firstly and then becomes a certain asymptotic value.