Disentanglement of coupled qubits

Abstract

Abstract:

In Markovian environment, the nature of entanglement dynamics and entanglement sudden death (ESD) of coupling qubits in the dissipative environment is investigated in detail using concurrence function. The results show:(1) the dynamic evolution of entanglement is closely related with temperature of the system , the initial entanglement and the initial quantum state.(2) Under normal circumstances,entanglement sudden death always occurs due to environmental effect;A specific area is found through numerical simulation,and the decay of entanglement is very slow in this region.Under the zero-temperature approximation, the specific conditions of entanglement sudden death and the equation for calculating the time of entanglement sudden death are both given.

Key words: quantum optics, entanglement, coupled qubits, Markovian environment, concurrence

CLC Number:

0431.2

FENG Bin-bin，ZOU Xiong，JI Ying-hua. Disentanglement of coupled qubits[J]. J4, 2012, 29(6): 701-707.

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Disentanglement of coupled qubits

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