cirq.pauli_expansion

Returns coefficients of the expansion of val in the Pauli basis.

cirq.pauli_expansion(
    val: Any,
    *,
    default: Union[value.LinearDict[str], TDefault] = RaiseTypeErrorIfNotProvided,
    atol: float = 1e-09
) -> Union[value.LinearDict[str], TDefault]

Args
`val`	The value whose Pauli expansion is to returned.
`default`	Determines what happens when `val` does not have methods that allow Pauli expansion to be obtained (see below). If set, the value is returned in that case. Otherwise, TypeError is raised.
`atol`	Ignore coefficients whose absolute value is smaller than this.

Returns
If `val` has a _pauliexpansion method, then its result is returned. Otherwise, if `val` has a small unitary then that unitary is expanded in the Pauli basis and coefficients are returned. Otherwise, if default is set to None or other value then default is returned. Otherwise, TypeError is raised.

Raises
`TypeError`	If `val` has none of the methods necessary to obtain its Pauli expansion and no default value has been provided.

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Last updated 2024-06-27 UTC.

cirq.pauli_expansion

Args

Returns

Raises