Interface QuantumBackend

All Superinterfaces:

Backend, ComputeBackend

All Known Implementing Classes:

AmazonBraketBackend, IBMQBackend, NativeQuantumBackend, PythonQuantumBackend, QiskitAerBackend, QiskitBackend, Quantum4JBackend, StrangeBackend

public interface QuantumBackend
extends ComputeBackend

Hardware interface for quantum computing backends.

Provides circuit construction, simulator execution, and hardware execution. Algorithm-level operations (VQE, QAOA, Grover, Shor) are in QuantumAlgorithmProvider, which uses this backend for execution.

Since:

1.2

Author:

Silvere Martin-Michiellot, Gemini AI (Google DeepMind)

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	QuantumBackend.QuantumCircuit	Quantum circuit representation.
static interface	QuantumBackend.QuantumResult	Quantum execution result.

Method Summary

Modifier and Type	Method	Description
QuantumBackend.QuantumCircuit	createCircuit(int numQubits, int numClassicalBits)	Creates a new quantum circuit.
default Map<String,Integer>	execute(QuantumBackend.QuantumCircuit circuit)	Executes a quantum circuit on a simulator with default 1024 shots.
QuantumBackend.QuantumResult	executeHardware(QuantumBackend.QuantumCircuit circuit, int shots, String backend)	Executes a quantum circuit on real quantum hardware.
QuantumBackend.QuantumResult	executeSimulator(QuantumBackend.QuantumCircuit circuit, int shots)	Executes a quantum circuit on a simulator.
String[]	getAvailableBackends()	Returns available quantum backends (simulators and hardware).
Map<String,Object>	getBackendInfo(String backendName)	Returns backend information (num_qubits, connectivity, etc.).
default String	getType()	Returns the backend type category (e.g., "plotting", "molecular", "tensor", "math").
boolean	isAvailable()	Checks if this backend is currently available (libraries loaded, etc.).

Methods inherited from interface Backend

getAlgorithmProviders, getName, getPriority, getStatusMessage, isExplicitlyDisabled, shutdown

Methods inherited from interface ComputeBackend

createBackend, createContext, getAcceleratorType, getDescription, getId, supportsComplexNumbers, supportsFloatingPoint, supportsParallelOps

Method Details

getType

default String getType()

Description copied from interface: Backend

Returns the backend type category (e.g., "plotting", "molecular", "tensor", "math").

Specified by:

getType in interface Backend

Specified by:

getType in interface ComputeBackend

isAvailable

boolean isAvailable()

Description copied from interface: Backend

Checks if this backend is currently available (libraries loaded, etc.).

Default implementation checks Backend.isExplicitlyDisabled() and returns false if it is.

Specified by:

isAvailable in interface Backend

createCircuit

QuantumBackend.QuantumCircuit createCircuit(int numQubits,
 int numClassicalBits)

Creates a new quantum circuit.

executeSimulator

QuantumBackend.QuantumResult executeSimulator(QuantumBackend.QuantumCircuit circuit,
 int shots)

Executes a quantum circuit on a simulator.

execute

default Map<String,Integer> execute(QuantumBackend.QuantumCircuit circuit)

Executes a quantum circuit on a simulator with default 1024 shots.

executeHardware

QuantumBackend.QuantumResult executeHardware(QuantumBackend.QuantumCircuit circuit,
 int shots,
 String backend)

Executes a quantum circuit on real quantum hardware.

getAvailableBackends

String[] getAvailableBackends()

Returns available quantum backends (simulators and hardware).

getBackendInfo

Map<String,Object> getBackendInfo(String backendName)

Returns backend information (num_qubits, connectivity, etc.).