Snapshot
class Snapshot(label, snapshot_type='statevector', num_qubits=0, num_clbits=0, params=None)
Simulator snapshot instruction.
Create new snapshot instruction.
Parameters
- label (str) – the snapshot label for result data.
- snapshot_type (str) – the type of the snapshot.
- num_qubits (int) – the number of qubits for the snapshot type [Default: 0].
- num_clbits (int) – the number of classical bits for the snapshot type [Default: 0].
- params (list or None) – the parameters for snapshot_type [Default: None].
Raises
ExtensionError – if snapshot label is invalid.
Attributes
decompositions
Get the decompositions of the instruction from the SessionEquivalenceLibrary.
definition
Return definition in terms of other basic gates.
label
Return snapshot label
params
return instruction params.
snapshot_type
Return snapshot type
Methods
add_decomposition
Snapshot.add_decomposition(decomposition)
Add a decomposition of the instruction to the SessionEquivalenceLibrary.
assemble
Snapshot.assemble()
Assemble a QasmQobjInstruction
broadcast_arguments
Snapshot.broadcast_arguments(qargs, cargs)
Validation of the arguments.
Parameters
- qargs (List) – List of quantum bit arguments.
- cargs (List) – List of classical bit arguments.
Yields
Tuple(List, List) – A tuple with single arguments.
Raises
CircuitError – If the input is not valid. For example, the number of arguments does not match the gate expectation.
c_if
Snapshot.c_if(classical, val)
Add classical condition on register classical and value val.
copy
Snapshot.copy(name=None)
Copy of the instruction.
Parameters
name (str) – name to be given to the copied circuit, if None then the name stays the same.
Returns
a copy of the current instruction, with the name
updated if it was provided
Return type
inverse
Snapshot.inverse()
Special case. Return self.
is_parameterized
Snapshot.is_parameterized()
Return True .IFF. instruction is parameterized else False
mirror
Snapshot.mirror()
For a composite instruction, reverse the order of sub-gates.
This is done by recursively mirroring all sub-instructions. It does not invert any gate.
Returns
a fresh gate with sub-gates reversed
Return type
qasm
Snapshot.qasm()
Return a default OpenQASM string for the instruction.
Derived instructions may override this to print in a different format (e.g. measure q[0] -> c[0];).
repeat
Snapshot.repeat(n)
Creates an instruction with gate repeated n amount of times.
Parameters
n (int) – Number of times to repeat the instruction
Returns
Containing the definition.
Return type
Raises
CircuitError – If n < 1.