Exponential decays of the ES probability at B = 55 mT. The upper sketch shows the measurement of the relaxation time from both ESs in parallel (blue circles). Here, the Read level is placed below both of the the ESs and above the GS. The lower sketch depicts the relaxation measurements from only the higher-energy ES (black circles). Here, the Read level is placed between the first and the second ESs. Dashed lines show the exponential fits with given times T 1 . Data points in a are presented as mean values the confidence interval of a single s.d. ( Methods ).
