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I am "brand new" to IBM quantum computing. Just created an account and tried my first circuit with a Hadamard applied to $|0 \rangle$ which should lead to $(|0\rangle + | 1 \rangle)/\sqrt{2}$ and hence $50$ percent probability for $|0\rangle$ and $|1\rangle$ each. However, as shown in the screenshot of my screen, I am getting probabilities for $``00"$. Is it possible to talk in terms of probabilities of $|0\rangle$ and $|1\rangle$?

enter image description here

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You are totally right. For 1 qubit there should be 50% on |1⟩ and 50% on |0⟩.

As in the picture shown you get the probabilities of 1 qubit, 50/50. Therefore you need to press the Inspector, to run that simulation. (As in the picture shown)

Result:

Press Inspector

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    $\begingroup$ But why should there be a second Hadamard when I am dealing with only one? In the youtube tutorial youtube.com/watch?v=7WkHEov3wwI, they use only one Hadamard $\endgroup$
    – Zubin
    Commented Jul 21, 2021 at 11:24
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    $\begingroup$ You are right. I had a mistake in reasoning. You need to run the Inspector. I updated my answer $\endgroup$
    – Ole Pannier
    Commented Jul 21, 2021 at 11:39
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    $\begingroup$ Thanks, it works! $\endgroup$
    – Zubin
    Commented Jul 21, 2021 at 11:43
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    $\begingroup$ You are welcome, sometimes the missing piece is simpler than quantum computing ;) $\endgroup$
    – Ole Pannier
    Commented Jul 21, 2021 at 11:46

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