The second plot generated by the code for visualizing magnetization over time uses the ylabel "magnetization $\langle Z_1 Z_2 \rangle$", which suggests a correlation measurement between the first and second qubits. However, the observable used is defined as SparsePauliOp(["ZI", "IZ"]), which measures the Z component independently on the first and second qubits. This leads to a potential misunderstanding of what the plot represents.
Suggested Label Changes
Instead of the current ylabel, I suggest one of the following, depending on the actual computation performed:
If measurements are plotted separately: Use two separate plots or labels stating $\langle Z_1 \rangle$ and $\langle Z_2 \rangle$ respectively.
If measurements are aggregated (e.g., summed or averaged): Use labels such as "Average magnetization of $Z_1$ and $Z_2$" or "Sum magnetization $\langle Z_1 \rangle + \langle Z_2 \rangle$".
How can we reproduce the issue?
run tutorial 10 pqvd.
Look where the following code is located (second plot).
Environment
Algorithms: 0.30
What is happening?
Description
The second plot generated by the code for visualizing magnetization over time uses the ylabel "magnetization $\langle Z_1 Z_2 \rangle$", which suggests a correlation measurement between the first and second qubits. However, the observable used is defined as
SparsePauliOp(["ZI", "IZ"]), which measures the Z component independently on the first and second qubits. This leads to a potential misunderstanding of what the plot represents.Suggested Label Changes
Instead of the current ylabel, I suggest one of the following, depending on the actual computation performed:
$\langle Z_1 \rangle$and$\langle Z_2 \rangle$respectively.How can we reproduce the issue?
run tutorial 10 pqvd.
Look where the following code is located (second plot).
Code Reference
The relevant code snippet is as follows:
What should happen?
Axis name should be $\langle Z_1 \rangle + \langle Z_2 \rangle$.
Any suggestions?
No response