QuantumVolume¶
- class QuantumVolume(num_qubits, depth=None, seed=None, classical_permutation=True)[source]¶
Bases:
qiskit.circuit.quantumcircuit.QuantumCircuit
A quantum volume model circuit.
The model circuits are random instances of circuits used to measure the Quantum Volume metric, as introduced in [1].
The model circuits consist of layers of Haar random elements of SU(4) applied between corresponding pairs of qubits in a random bipartition.
Reference Circuit:
Expanded Circuit:
References:
[1] A. Cross et al. Validating quantum computers using randomized model circuits, Phys. Rev. A 100, 032328 (2019). [arXiv:1811.12926]
Create quantum volume model circuit of size num_qubits x depth.
- Parameters
num_qubits (
int
) – number of active qubits in model circuit.depth (
Optional
[int
]) – layers of SU(4) operations in model circuit.seed (
Union
[int
,Generator
,None
]) – Random number generator or generator seed.classical_permutation (
bool
) – use classical permutations at every layer, rather than quantum.
Attributes
- ancillas¶
Returns a list of ancilla bits in the order that the registers were added.
- Return type
List
[AncillaQubit
]
- calibrations¶
Return calibration dictionary.
- The custom pulse definition of a given gate is of the form
{‘gate_name’: {(qubits, params): schedule}}
- Return type
dict
- clbits¶
Returns a list of classical bits in the order that the registers were added.
- Return type
List
[Clbit
]
- data¶
Return the circuit data (instructions and context).
- Returns
a list-like object containing the
CircuitInstruction
s for each instruction.- Return type
QuantumCircuitData
- extension_lib = 'include "qelib1.inc";'¶
- global_phase¶
Return the global phase of the circuit in radians.
- Return type
Union
[ParameterExpression
,float
]
- header = 'OPENQASM 2.0;'¶
- instances = 87¶
- metadata¶
The user provided metadata associated with the circuit
The metadata for the circuit is a user provided
dict
of metadata for the circuit. It will not be used to influence the execution or operation of the circuit, but it is expected to be passed between all transforms of the circuit (ie transpilation) and that providers will associate any circuit metadata with the results it returns from execution of that circuit.- Return type
dict
- num_ancillas¶
Return the number of ancilla qubits.
- Return type
int
- num_clbits¶
Return number of classical bits.
- Return type
int
- num_parameters¶
Convenience function to get the number of parameter objects in the circuit.
- Return type
int
- num_qubits¶
Return number of qubits.
- Return type
int
- op_start_times¶
Return a list of operation start times.
This attribute is enabled once one of scheduling analysis passes runs on the quantum circuit.
- Return type
List
[int
]- Returns
List of integers representing instruction start times. The index corresponds to the index of instruction in
QuantumCircuit.data
.- Raises
AttributeError – When circuit is not scheduled.
- parameters¶
Convenience function to get the parameters defined in the parameter table.
- Return type
ParameterView
- prefix = 'circuit'¶