Sudden violation of the CHSH inequality in a two qubits system

Details Sudden violation of the CHSH inequality in a two qubits system Sudden violation of the CHSH inequality in a two qubits system

2010-02-04

arxiv.org/abs/1002.1000v1

Physics

Quantum Physics

Accepted by Physica Scripta as part of the Proceedings of CEWQO09

Scientific paper

I study the dynamics of the violation of the CHSH inequality for two qubits interacting with a common zero-temperature non-Markovian environment. I demonstrate sudden violation of the inequality for two qubits initially prepared in a factorized state. Due to the strong coupling between the qubits and the reservoir, the dynamics is characterized by numerous sharp revivals. Furthermore I focus on a more realistic physical system in which the spontaneous emission for the qubits is taken into account. When including spontaneous emission even for small decay parameters, revivals in the violation are heavily damped out. If the decay rates exceed a certain threshold, the inequality turns out to be always satisfied.

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