Complete four-photon cluster-state analyzer based on cross-Kerr nonlinearity
Zhihui Wang, Long Zhu, Shi‐Lei Su, Qi Guo, Liu‐Yong Cheng, Ai‐Dong Zhu, Shou Zhang · Chinese Physics B · 2013
We propose a method to construct an optical cluster-state analyzer based on cross-Kerr nonlinearity combined with linear optics elements. In the scheme, we employ two four-qubit parity gates and the controlled phase gate (CPG) from only the cross-Kerr nonlinearity and show that all the orthogonal four-qubit cluster states can be completely identified. The scheme is significant for the large-scale quantum communication and quantum information processing networks. In addition, the scheme is feasible and deterministic under current experimental conditions.