Extracting Qubit Indices #1587
Extracting Qubit Indices #1587
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| " # Method 2: Using qubits.index to get the index\n", | ||
| " qarg_indices_index = [qc.qubits.index(qarg) for qarg in qargs]\n", | ||
| " print(\"qargs indices (index):\", qarg_indices_index)\n", | ||
| " print(\"\\n\")" |
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We should not recommend this, it will have significant performance overhead which scales quadratically with the number of qubit it's almost never the right thing to do. The find_bit() pattern was added specifically to have a constant time lookup for this and should be the only thing we recommend.
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@mtreinish what do you suggest should we add only the find_bit() pattern
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@mtreinish for some reason I am not able to make changes directly into the source code of the ipynb file do you want me to make a notebook for this |
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I'm closing this PR as this issue is already being worked on by another contributor. |
Hi Frank thanks but I have not heard back from you on the blogpost yet for our project can I get an update |
the issue brought up by the users on Slack regarding how to retrieve the index of a qubit within a QuantumCircuit object. The original documentation lacked clarity on this point, which led to confusion among users. The updated version explains how to extract the index of a qubit from a Qubit object using both QuantumCircuit.find_bit() and QuantumCircuit.qubits.index(), ensuring that users can easily understand how to manage qubits and registers in their circuits.
fixes #1469