SnapshotStatevector
SnapshotStatevector(label, num_qubits=0)
Snapshot instruction for statevector snapshot type
Create a statevector state snapshot instruction.
Parameters
- label (str) – the snapshot label.
- num_qubits (int) – the instruction barrier size [Default: 0].
Raises
ExtensionError – if snapshot is invalid.
Additional Information:
This snapshot is always performed on all qubits in a circuit. The number of qubits parameter specifies the size of the instruction as a barrier and should be set to the number of qubits in the circuit.
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
SnapshotStatevector.add_decomposition(decomposition)
Add a decomposition of the instruction to the SessionEquivalenceLibrary.
assemble
SnapshotStatevector.assemble()
Assemble a QasmQobjInstruction
broadcast_arguments
SnapshotStatevector.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
SnapshotStatevector.c_if(classical, val)
Add classical condition on register classical and value val.
copy
SnapshotStatevector.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
define_snapshot_register
static SnapshotStatevector.define_snapshot_register(circuit, label, qubits=None)
Defines qubits to snapshot for all snapshot methods
inverse
SnapshotStatevector.inverse()
Special case. Return self.
is_parameterized
SnapshotStatevector.is_parameterized()
Return True .IFF. instruction is parameterized else False
mirror
SnapshotStatevector.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
SnapshotStatevector.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
SnapshotStatevector.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.