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What is the reason for high variation in measurement probability results of a simple 3/4 qubit measurement circuit on IBM Melbourne machine in comparison with the same circuit being run on IBM Vigo/Santiago.

Variation in Vigo: approx. 0.7

Variation in Melbourne: approx. 2.6

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  • $\begingroup$ Melbourne is a very old design compared to Vigo. $\endgroup$ Sep 25 '20 at 0:28
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There are many factors that going into this, but most of them are boiled down together into a metric that IBM called Quantum Volume (QV).

ibmq_vigo has a QV of 16:

Snapshot of Vigo's QV from IBMQ Experience website

Where as ibmq_16_melbourne as QV of 8:

enter image description here

You can read more about QV here: https://qiskit.org/textbook/ch-quantum-hardware/measuring-quantum-volume.html

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