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An object that knows its expansion in the Pauli basis.
_pauli_expansion_() -> value.LinearDict[str]
Efficiently obtains expansion of self in the Pauli basis.
|Linear dict keyed by name of Pauli basis element. The names consist of n captal letters from the set 'I', 'X', 'Y', 'Z' where n is the number of qubits. For example, 'II', 'IX' and 'XY' are valid Pauli names in the two-qubit case.|