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Modules
equality_constraint_projection module: Module to reduce operator variance using equality RDM constraints.
fermion_partitioning module
qubit_partitioning module: Code to generate Pauli strings for measurement of local operators
rdm_equality_constraints module: Constraints on fermionic reduced density matrices
vpe_estimators module: Classes to assist in processing of VPE (ArXiv:2010.02538) signal data
Classes
class PhaseFitEstimator: A VPE estimator that works by fitting a set of known frequencies.
Functions
apply_constraints(...): Function to use linear programming to apply constraints.
binary_partition_iterator(...): Generator for a list of 2-partitions of N qubits such that all pairs of qubits are split in at least one partition, This follows a variation on ArXiv:1908.0562 - instead of explicitly partitioning the list based on the binary indices of the qubits, we repeatedly divide the list in two and then zip it back together.
constraint_matrix(...): Function to generate matrix of constraints.
get_interaction_rdm(...): Build an InteractionRDM from measured qubit operators.
get_phase_function(...): Generates an estimate of the phase function g(t) from circuit output
group_into_tensor_product_basis_sets(...): Split an operator (instance of QubitOperator) into sub-operator QubitOperators, where each sub-operator has terms that are diagonal in the same tensor product basis.
linearize_term(...): Function to return integer index of term indices.
one_body_fermion_constraints(...): Generates one-body positivity constraints on fermionic RDMs.
operator_to_vector(...): Function to map operator to vector.
pair_between(...): Pairs between two fragments of a larger list
pair_within(...): Generates pairings of labels that contain each pair at least once.
pair_within_simultaneously(...): Generates simultaneous pairings between four-element combinations
pair_within_simultaneously_binned(...): Generates symmetry-respecting pairings between four-elements in a list
pair_within_simultaneously_symmetric(...): Generates symmetry-respecting pairings between four-elements in a list
partition_iterator(...): Generator for a list of k-partitions of N qubits such that all sets of k qubits are perfectly split in at least one partition, following ArXiv:1908.05628
pauli_string_iterator(...): Generates a set of Pauli strings such that each word of k Pauli operators lies in at least one string.
two_body_fermion_constraints(...): Generates two-body positivity constraints on fermionic RDMs.
unlinearize_term(...): Function to return integer index of term indices.
vector_to_operator(...): Function to map vector to operator.