Extended Data Fig. 1: Ancilla-assisted generation of a cluster state with negative weights.
From: Generation of three-dimensional cluster entangled state
The same method as Fig. 4 is used to generate a 3D cluster state with negative weights. a, Four edges (6-7, 6-13, 9-10, and 10-11) in Gbasic have negative weights. b, Experimentally generated 3D cluster state after local phase correction in the range of (− 0.18, 0.18) rad. c, Nullifier measurements on the generated 3D cluster state. d, Conditional covariance matrix in the target modes. e, Inseparability test for the cluster state in (d), exhibiting negative minimum eigenvalues for all bipartitions. f, Nullifier variances of the target cluster state after removing the ancilla. In c and f, data are presented as scatter plots (from four repeated experiments), with mean values as bar charts and ± 1 s.d. as error bars.
