Hello,
In exercice 3 I computed the trace classically and I got -0.2916 and I ran the trace estimation circuit and got 0.4992.
"classically" computed trace 
trace estimation circuit measurement 
Here is my circuit:
Hello,
Assuming you are doing the rest of the calculation correctly, may be you need to increase the number of shots to get an accurate result, may be 1 million shots.
Assuming you are doing the rest of the calculation correctly, may be you need to increase the number of shots to get an accurate result, may be 1 million shots.
