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Aware of how a 1-bit flip can be fixed for 3-qubit input by having 2 Ancilla bits, encoding, and using the Toffoli gate to fix the error and decode. How can this idea be extended for a 2-bit flip (either 2 of the 3 qubit-inputs) and what does the circuit look like?

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  • $\begingroup$ What are your thoughts on this? Have you tried any approaches to construct such a code? $\endgroup$
    – FDGod
    Nov 11, 2023 at 4:19

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I was able to figure it out now via taking 3 ancilla qubits instead of 2 and figuring out the invariant in case 2 bits are flipped.

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    $\begingroup$ Please add the circuit, if possible, and the approach you have taken so that this post will be helpful to others in the future. $\endgroup$
    – FDGod
    Nov 11, 2023 at 6:39
  • $\begingroup$ As it’s currently written, your answer is unclear. Please edit to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers in the help center. $\endgroup$
    – Community Bot
    Nov 12, 2023 at 7:57

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