Table 3 Self-replication and interaction with the environment in the σ_x basis.

Basis element	0000	0001	0010	0011	0100	0101	0110	0111	1000	1001	1010	1011	1100	1101	1110	1111
Measured events	753	246	277	52	448	747	569	513	343	493	616	177	717	679	345	749
Predicted events	624	1	77	547	157	1150	704	603	77	547	624	1	704	603	157	1150

Number of measurements for every element of the four-qubit basis rotated to σ_x. The experimental value for 〈σ_x ⊗ σ_x ⊗ σ_x ⊗ σ_x〉 is 0.22 while the ideal value is 0.56. Again, the qubits have been reordered to coincide with the ideal results in the |g₁p₁g₂p₂〉 basis. An additional point to remark here is the fact that the global value of 〈σ_x ⊗ σ_x ⊗ σ_x ⊗ σ_x〉 is different to the product of 〈σ_x ⊗ σ_x〉 for each individual, which yields a value of 0. This calculation shows that both individuals are indeed causally related.

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