SnapshotExpectationValue¶

class SnapshotExpectationValue(label, op, single_shot=False, variance=False)[source]¶

Bases: qiskit.providers.aer.extensions.snapshot.Snapshot

Snapshot instruction for supported methods of Qasm simulator.

Create an expectation value snapshot instruction.

Parameters

label (str) – the snapshot label.
op (Operator) – operator to snapshot.
single_shot (bool) – return list for each shot rather than average [Default: False]
variance (bool) – compute variance of values [Default: False]

Raises

ExtensionError – if snapshot is invalid.

Note

This instruction will be deprecated after the qiskit-aer 0.8 release. It has been superseded by the qiskit.providers.aer.library.SaveExpectationValue and qiskit.providers.aer.library.SaveExpectationValueVariance instructions.

Methods

`add_decomposition`	Add a decomposition of the instruction to the SessionEquivalenceLibrary.
`assemble`	Assemble a QasmQobjInstruction for snapshot_expectation_value.
`broadcast_arguments`	Validation of the arguments.
`c_if`	Add classical condition on register or cbit classical and value val.
`copy`	Copy of the instruction.
`define_snapshot_register`	Defines qubits to snapshot for all snapshot methods
`inverse`	Special case.
`is_parameterized`	Return True .IFF.
`mirror`	DEPRECATED: use instruction.reverse_ops().
`qasm`	Return a default OpenQASM string for the instruction.
`repeat`	Creates an instruction with gate repeated n amount of times.
`reverse_ops`	For a composite instruction, reverse the order of sub-instructions.
`soft_compare`	Soft comparison between gates.
`validate_parameter`	Instruction parameters has no validation or normalization.

Attributes

decompositions¶: Get the decompositions of the instruction from the SessionEquivalenceLibrary.