Generation of arbitrary four-photon polarization-entangled decoherence-free states
Yan-Xiao Gong, Xu‐Bo Zou, Xiao-Ling Niu, Jian Li, Yun‐Feng Huang, Guang‐Can Guo · Physical Review A · 2008
We propose a scheme to generate four-photon polarization-entangled states, which enables the encoding of an arbitrary qubit into a four-qubit decoherence-free subspace robust against collective decoherence. The scheme is based on linear optical elements and postselection strategy, which is feasible with existing experimental technology.