Figure 2

From: Preserving entanglement during weak measurement demonstrated with a violation of the Bell–Leggett–Garg inequality

Figure 2
Figure 2

Graph showing both experimental data (points) and theoretical predictions (lines) for the correlator C and its four terms versus measurement strength ϕ. The horizontal gold line denotes the classical bound on C. The data set was taken by averaging together 200 traces in which each point was measured 3,000 times for a total of 600,000 iterations per point. The error bars represent 10 s.d. of the mean to demonstrate the scaling of the ancilla measurement noise versus ϕ. The magnitude of the correlations between each pair of qubits reveals the extent to which entanglement has been broken for each measurement strength.