Combine Pauli measurements and postselection

[ddddddanni]

No description provided.

[eliottrosenberg]

Thanks, Danni! This is a really great start! In addition to the comments below, it would be great if we could return the fraction of the bitstrings that survive the postselection, and maybe even more granular information in addition, like how many violate each of the symmetries. Maybe we can also optionally return the raw bitstrings to the users in case they want to do more analysis on them.

[eliottrosenberg]

-> "The final state generated by the circuit is an eigenvector ... with the specified eigenvalues."

[eliottrosenberg]

Maybe this should default to None?

[eliottrosenberg]

I realized that if I try to construct a dictionary with PauliSums as keys, I get the error TypeError: unhashable type: 'PauliSum'. Do you have any suggestions of what to do here? Should we use tuples or make a new data structure?

[ddddddanni]

Thanks, Danni! This is a really great start! In addition to the comments below, it would be great if we could return the fraction of the bitstrings that survive the postselection, and maybe even more granular information in addition, like how many violate each of the symmetries. Maybe we can also optionally return the raw bitstrings to the users in case they want to do more analysis on them.

I actually have

@attrs.frozen
class PostFilteringSymmetryCalibrationResult:
    """Result of post-selection symmetry calibration.
    Attributes:
        raw_bitstrings: The raw bitstrings obtained from the measurement.
        filtered_bitstrings: The bitstrings after applying post-selection symmetries.
    """

    raw_bitstrings: np.ndarray
    filtered_bitstrings: np.ndarray

Maybe I can add:

1. fraction_of_survived_bistrings: float
2. symmetry_to_filtered_bistrings: dict{paulistring|paulisum, list[bitstrings]}?

[eliottrosenberg]

Do we need this input given that we have circuits_to_pauli_params?

[eliottrosenberg]

I guess the user doesn't use this function directly, so it's ok

[eliottrosenberg]

@ddddddanni ah, I missed that I can do .calibration_result.filtered_bitstrings and .calibration_result.calibration_result.filtered_bitstrings. That's great! Thanks!