Physics – Quantum Physics
Scientific paper
2002-09-02
Phys.Rev. A68 (2003) 012111
Physics
Quantum Physics
comments and references added, 18 pages, 1 figure
Scientific paper
10.1103/PhysRevA.68.012111
We study the time evolution of the entangled kaon system by considering the Liouville - von Neumann equation with an additional term which allows for decoherence. We choose as generators of decoherence the projectors to the 2-particle eigenstates of the Hamiltonian. Then we compare this model with the data of the CPLEAR experiment and find in this way an upper bound on the strength $\lambda$ of the decoherence. We also relate $\lambda$ to an effective decoherence parameter $\zeta$ considered previously in literature. Finally we discuss our model in the light of different measures of entanglement, i.e. the von Neumann entropy $S$, the entanglement of formation $E$ and the concurrence $C$, and we relate the decoherence parameter $\zeta$ to the loss of entanglement: $1 - E$.
Bertlmann Reinhold A.
Durstberger Katharina
Hiesmayr Beatrix C.
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