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Dense Coding in a Two-Spin Squeezing Model with Intrinsic Decoherence
Ist Teil von
International journal of theoretical physics, 2016-11, Vol.55 (11), p.4731-4739
Ort / Verlag
New York: Springer US
Erscheinungsjahr
2016
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Quantum dense coding in a two-spin squeezing model under intrinsic decoherence with different initial states (Werner state and Bell state) is investigated. It shows that dense coding capacity
χ
oscillates with time and finally reaches different stable values.
χ
can be enhanced by decreasing the magnetic field Ω and the intrinsic decoherence
γ
or increasing the squeezing interaction
μ
, moreover, one can obtain a valid dense coding capacity (
χ
satisfies
χ
> 1) by modulating these parameters. The stable value of
χ
reveals that the decoherence cannot entirely destroy the dense coding capacity. In addition, decreasing Ω or increasing
μ
can not only enhance the stable value of
χ
but also impair the effects of decoherence. As the initial state is the Werner state, the purity
r
of initial state plays a key role in adjusting the value of dense coding capacity,
χ
can be significantly increased by improving the purity of initial state. For the initial state is Bell state, the large spin squeezing interaction compared with the magnetic field guarantees the optimal dense coding. One cannot always achieve a valid dense coding capacity for the Werner state, while for the Bell state, the dense coding capacity
χ
remains stuck at the range of greater than 1.