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In the superconducting charge qubit implementation of the qubit what I've understood is that we read a 1 if a Cooper pair has gone through the Josephson Junction into the "island" and we read a 0 if there is no Cooper pair. How come it's only possible that one Cooper pair passes the Josephson Junction? I don't really understand how this is a binary system as there seems to be more than two possibilities when one measures the system.

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  • $\begingroup$ are you asking about dual rail encoding? if you are then this has some details : arxiv.org/abs/2307.08737 $\endgroup$
    – unknown
    Nov 13, 2023 at 18:28
  • $\begingroup$ No sorry, I'm just asking how a superconducting charge qubit actually works. $\endgroup$
    – Omeglac
    Nov 19, 2023 at 9:12

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