Utilities (qiskit.utils)

deprecate_arguments(kwarg_map)	Decorator to automatically alias deprecated argument names and warn upon use.
deprecate_function(msg[, stacklevel])	Emit a warning prior to calling decorated function.
local_hardware_info()	Basic hardware information about the local machine.
is_main_process()	Checks whether the current process is the main one
apply_prefix(value, unit)	Given a SI unit prefix and value, apply the prefix to convert to standard SI unit.

Algorithm Utilities

summarize_circuits	Summarize circuits based on QuantumCircuit, and five metrics are summarized.
get_entangler_map	Utility method to get an entangler map among qubits.
validate_entangler_map	Validate a user supplied entangler map and converts entries to ints.
has_ibmq	Check if IBMQ is installed
has_aer	check if Aer is installed
name_args	Decorator to convert unnamed arguments to named ones.
algorithm_globals	Class for global properties.

QuantumInstance

Quantum Backend including execution setting.

A QuantumInstance holds the Qiskit backend as well as a number of compile and runtime parameters controlling circuit compilation and execution. Quantum algorithms are run on a device or simulator by passing a QuantumInstance setup with the desired backend etc.