Add StabilizerTable class
#3931
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chriseclectic
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Changelog: New Feature
* Symplectic representation of a list of N-qubit Pauli's with +1 or -1 phases
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Mar 23, 2020
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| class StabilizerTable(PauliTable): | ||
| r"""Symplectic representation of a list Stabilizer matrices. |
| \end{array}\right) | ||
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| where each row is a block vector :math:`[X_i, Z_i]` with | ||
| :math:`X = [x_{i,0}, ..., x_{i,N-1}]`, :math:`Z = [z_{i,0}, ..., z_{i,N-1}]` |
| """ | ||
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| def __init__(self, data, phase=None): | ||
| """Initialize the PauliTable. |
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| def __getitem__(self, key): | ||
| """Return a view of StabilizerTable""" | ||
| if isinstance(key, (int, np.int)): |
There was a problem hiding this comment.
isinstance(np.int(2), int) returns True so not sure these need to be distinguished.
| Pauli rows (Default: False). | ||
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| Returns: | ||
| PauliTable: the resulting table with the entries inserted. |
| sort_inds = index.argsort() | ||
| index = index[sort_inds] | ||
| unique = self[index] | ||
| # Concatinate return tuples |
| if not isinstance(other, StabilizerTable): | ||
| other = StabilizerTable(other) | ||
| if qargs is None and other.num_qubits != self.num_qubits: | ||
| raise QiskitError("other PauliTable must be on the same number of qubits.") |
There was a problem hiding this comment.
Would it be better to reference StabilizerTable here?
| r"""Convert to a list or array of Stabilizer matrices. | ||
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| For large StabilizerTables converting using the ``array=True`` | ||
| kwarg will be more efficient since it allocates memory a full |
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| with self.subTest(msg='str init "I"'): | ||
| value = StabilizerTable('I')._array | ||
| target = np.array([[False, False]], dtype=np.bool) | ||
| self.assertTrue(np.all(np.array(value == target))) |
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This test is already covered above.
ewinston
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Mar 26, 2020
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faisaldebouni
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Aug 5, 2020
* Add StabilizerTable class * Symplectic representation of a list of N-qubit Pauli's with +1 or -1 phases * Add stabilizer table tests * Add release note * Fix _add and _multiply methods * Linting * Update qubit ordering and tests * Doc warning fix * Rename n_qubits to num_qubits * Add qargs add to StabilizerTable * Fix links in release note * Update for review comments Co-authored-by: ewinston <ewinston@us.ibm.com>
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Summary
PauliTablesymplectic operator class #3889 (on-hold until merged)Adds a
StabilizerTablesubclass ofPauliTablethat is an efficient representation of a list of N-qubit stabilizers (real Pauli matrices with +1 or -1 coefficients). This class is implemented by adding a boolean phase vector the Pauli table symplectic array.This class will be used as a basis for a Clifford operator class.
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