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I'm new to IBM, so I'm still figuring things out. I want to make a POVM measurement of a quantum state for state discrimination purposes. In other words I want a measurement that has three outcomes:

A: It's state A with 100 % certainty (or x %) B: It's state B with 100 % certainty (or x %) C: Can't determine if it's state A or B.

Can anyone help with how to do this in IBM's Quantum Composer?

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    $\begingroup$ The general idea is that you have to dilate your POVM into a projective measurement, as described in the Wikipedia article. An specific implementation for a quantum computer using qubits is described in this exercise sheet. $\endgroup$
    – Mateus Araújo
    Mar 8 at 13:02

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