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Why IBM devices have the same number of qubit and the same architecture, but the error rates are different?
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They have different error rates because they are two different physical devices! This relates to the manufacturing processes of these chips. Every device is unique and will have its own fingerprint ...

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Can't plot points on the Bloch sphere (QuTip)
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1 votes

I found a solution to my problem here https://github.com/qutip/qutip/issues/1027 Apparently plotting points on the Bloch sphere does not work with Matplotlib v3.1.0. So I had to downgrade to v.3.0.3 ...

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