SCHEME FOR ENTANGLEMENT CONCENTRATION OF UNKNOWN W CLASS STATES IN BAD CAVITIES
LI-HUA ZHANG, Ming Yang, Qishen Wang, Zhuo‐Liang Cao · International Journal of Modern Physics B · 2010
In this paper, we propose an entanglement concentration protocol for unknown tripartite W class states via the detection of photons which are leaked out from the cavities. In our scheme, the atom-cavity coupling strength is smaller than the cavity decay rate. Hence, the requirement on the quality factor of the cavities is greatly relaxed. The scheme is for nonpost-selection results and the fidelity of the scheme is not affected by the detection inefficiency and atomic decay. All the processes are within the current technologies.