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I am not able to undo an operation. For example, I want a single Hadamard gate on a single qubit but by mistake two Hadamard gate added. Now I want to remove one of them without interrupting kernel. Is there any easy way. Please help me. Thank you.

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  • $\begingroup$ Could you elaborate a bit? Inside a jupyter notebook, you could easily remove a gate from your code by removing a line such as circuit.h(0). $\endgroup$
    – Francois
    Jul 29 '20 at 10:16
  • $\begingroup$ Yes! That is exactly what I wanted to say. Thank you $\endgroup$ Jul 29 '20 at 14:11
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To remove the last gate you can do qc.data.pop().

Example:

qc = QuantumCircuit(1)
qc.h(0)
qc.draw('text')

output:

     ┌───┐
q_0: ┤ H ├
     └───┘

Then:

qc.data.pop()
qc.draw('text')

output:

q_0: 
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  • $\begingroup$ Thank you very much @Frank. It helps a lot for beginners like me. $\endgroup$ Jul 29 '20 at 14:18

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