Nuclear magnetic resonance for quantum computing: Techniques and recent achievements
Xin Tao1, Wang Bi-Xue1, Li Ke-Ren1, Kong Xiang-Yu1, Wei Shi-Jie1, Wang Tao1, Ruan Dong1, Long Gui-Lu1, 2, 3,
       

(color online) Description of the RT formula. The bulk minimal surface (blue line) is anchored at the boundary of the boundary region A. (b) An example of tensor network state. The (hexagon) nodes represent tensors. The links represent the contraction of tensors. The dangling legs are physical DOFs in many-body system. The red dashed curve illustrates the virtual surface S anchored to region A, which cuts a minimal number of links.[153]