# SnapshotDensityMatrix¶

class SnapshotDensityMatrix(label, num_qubits)[Quellcode]

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

Snapshot instruction for density matrix method of Qasm simulator.

Create a density matrix state snapshot instruction.

Parameter
• label (str) – the snapshot label.

• num_qubits (int) – the number of qubits to snapshot.

Verursacht

ExtensionError – if snapshot is invalid.

Veraltet ab Version 0.9.0: This instruction has been deprecated and will be removed no earlier than 3 months from the 0.9.0 release date. It has been superseded by the qiskit.providers.aer.library.SaveDensityMatrix instruction.

Methods

 add_decomposition Add a decomposition of the instruction to the SessionEquivalenceLibrary. assemble Assemble a QasmQobjInstruction 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.

definition

Return definition in terms of other basic gates.

duration

Get the duration.

label

Return snapshot label

params

return instruction params.

snapshot_type

Return snapshot type

unit

Get the time unit of duration.