Measurement inconsistency in Qiskit

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Asked 5 years, 6 months ago

Modified 5 years, 6 months ago

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I am using Qiskit in an algorithm. In the end, I am measuring exactly a register of 4 qubits but the histograms show states with 5 qubits.

This is the code I used:

qwc = QuantumCircuit(qnodes, qnodes2, cqnodes, cqnodes2)
qwc.measure(qnodes, cnodes)
qwc.draw(output="mpl")

and finally qnodes2 is measured and represented in the plot as states qubits?

Any ideas what the problem might be?

Sanchayan Dutta

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asked Jun 6, 2019 at 13:59

user1319236

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$\begingroup$ Thanks for the question. Could you post some code so that I could reproduce the problem? $\endgroup$
– James Wootton
Commented Jun 6, 2019 at 14:05
$\begingroup$ qwc = QuantumCircuit(qnodes, qnodes2, cqnodes, cqnodes2) And then qwc.measure(qnodes, cnodes) and then qwc.draw(output="mpl") finally i get qnodes2 measured and represented in the plot as states qubits $\endgroup$
– user1319236
Commented Jun 6, 2019 at 14:21
$\begingroup$ Thanks for the code. However, I'm still unsure exactly how large these registers are, and how you call execute. So I've not been able to reproduce it. $\endgroup$
– James Wootton
Commented Jun 7, 2019 at 7:11
$\begingroup$ qnodes 4 and qnodes2 just 1 execution is like : qwc = runQWC(qwc) $\endgroup$
– user1319236
Commented Jun 11, 2019 at 0:06
$\begingroup$ You measured in cnodes but the circuit includes cqnodes and cqnodes2... $\endgroup$
– luciano
Commented Sep 9, 2020 at 16:55

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