Generating Quantum Correlation and Entanglement Using Odd and Even Coherent State Signal Fields
In order to achieve non-classical correlations between two atoms,the quantum correlation and entanglement between two atoms in an atomic ensemble were studied using the mapping technique of quantum states in the electromagnetic induced transparency(EIT)mechanism.The results show that quantum correla-tions and entanglements characterized by measurement-induced disturbance(MID)and concurrence can be adiabatic generated,but the evolution of the two is completely different as the average number of photons in-creases.Whether the signal field is an odd or even coherent state,an increase in the average number of pho-tons is beneficial for the generation of quantum correlations.For the odd coherent state probe field,quantum entanglement gradually decreases with the increase of photon number;For even coherent state probe fields,there is an increasing and then declining process in quantum entanglement.Quantum entanglement and corre-lation are weakened as the number of atoms in the ensemble increases due to an increase in atom decoherence.
electromagnetically induced optical transparencyodd and even coherent statequantum corre-lationquantum entanglement
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