# Legacy Operators (qiskit.aqua.operators.legacy)¶

These are the Operators provided by Aqua up until the 0.6 release. These are being replaced by the operator flow function and we encourage you to use this.

Note

At some future time this legacy operator logic will be deprecated and removed.

# Legacy Operators¶

 LegacyBaseOperator Operators relevant for quantum applications. WeightedPauliOperator Weighted Pauli Operator TPBGroupedWeightedPauliOperator TPB Grouped Weighted Pauli Operator MatrixOperator Operators relevant for quantum applications

# Legacy Operator support¶

 evolution_instruction Construct the evolution circuit according to the supplied specification. suzuki_expansion_slice_pauli_list Compute the list of pauli terms for a single slice of the suzuki expansion following the paper https://arxiv.org/pdf/quant-ph/0508139.pdf. pauli_measurement Add the proper post-rotation gate on the circuit. measure_pauli_z Appropriate post-rotations on the state are assumed. covariance Compute the covariance matrix element between two Paulis, given the measurement outcome. row_echelon_F2 Computes the row Echelon form of a binary matrix on the binary finite field kernel_F2 Computes the kernel of a binary matrix on the binary finite field commutator Compute commutator of op_a and op_b or the symmetric double commutator of op_a, op_b and op_c. check_commutativity Check the (anti-)commutativity between two operators. PauliGraph Pauli Graph. Z2Symmetries Z2 Symmetries