We show that entanglement of multiple atoms can arise via resonant interaction with a displaced thermal field with a macroscopic photon-number. The cavity field acts as the catalyst, which is disentangled with the atomic system after the operation. Remarkably, the entanglement speed does not decrease as the average photon-number of the mixed thermal state increases. The atoms may evolve to a highly entangled state even when the photon-number of the cavity mode approaches infinity.
@article{arxiv.1203.1455,
title = {Macroscopic displaced thermal field as the entanglement catalyst},
author = {Shi-Biao Zheng},
journal= {arXiv preprint arXiv:1203.1455},
year = {2012}
}
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Quantum Information & Computation Volume 7 Issue 8, November 2007