Degree of entanglement in a quantum measurement process

Details Degree of entanglement in a quantum measurement process Degree of entanglement in a quantum measurement process

2002-04-10

arxiv.org/abs/quant-ph/0204054v1

Phys. Rev. A, 66 (2002) 022113

Physics

Quantum Physics

Revtex, 8 pages, 5 eps figures

Scientific paper

10.1103/PhysRevA.66.022113

We suggest a quantum measurement model in an ion trap which specifies the probability distribution of two, distinct internal ground states of a trapped four-level ion. The external degrees of motion of the four-level ion constitute the meter which, in turn, is coupled to the environment by engineered reservoirs. In a previous publication, a similar measurement model was employed to test decoherence effects on quantum nonlocality in phase space on the basis of coincidence measurements of the entangled system-meter scheme. Here, we study the effects of decoherence on the entanglement of formation characterized by the concurrence. The concurrence of the system enables to find the maximum possible violation of the Bell inequality. Surprisingly, this model gives illustrative insights into the question to what extend the Bell inequality can be considered as a measure of entanglement.

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