Nondestructive N-atom Greenberger–Horne–Zeilinger state analyzer via the cavity input–output process
Long Zhu, Hong‐Fu Wang, Shi‐Lei Su, Qi Guo, Li-Li Sun, Shou Zhang · Journal of the Optical Society of America B · 2012
We propose a deterministic scheme to realize N-atom Greenberger–Horne–Zeilinger (GHZ) state analyzer based on the cavity input–output process. In the scheme, we construct a two-qubit parity analyzer and a GHZ-state phase analyzer and show that all the N-atom GHZ states can be completely identified in a nondestructive way by combining these two kinds of analyzers. The fidelities of our analyzers are also calculated, which show that our scheme has a high performance in theory. The scheme opens promising perspectives for achieving efficient large-scale quantum communication and quantum information processing networks.