Contextuality and Wigner-function negativity in qubit quantum computation
Contextuality and Wigner-function negativity in qubit quantum computation
We describe schemes of quantum computation with magic states on qubits for which contextuality and negativity of the Wigner function are necessary resources possessed by the magic states. These schemes satisfy a constraint. Namely, the non-negativity of Wigner functions must be preserved under all available measurement operations. Furthermore, we identify …