Table 1. Inseparability of entangled modes.

N	I	II	III	IV	V	VI	VII	Average
2	0.39							0.39
3	0.56	0.56						0.56
4	0.64	0.63	0.64					0.64
5	0.69	0.69	0.70	0.70				0.69
6	0.73	0.73	0.75	0.74	0.74			0.74
7	0.77	0.78	0.77	0.76	0.77	0.77		0.77
8	0.79	0.79	0.78	0.81	0.79	0.80	0.79	0.79

Data are based on the van Loock–Furusawa criteria, given in equation (4). Each row shows that for a basis of N quantum modes, the N−1 values obtained from quadrature variances are well below 1. This verifies entanglement of the N modes.

Uncertainty is ±0.01 in all cases.