Simulation Backends

Simulator interfaces, state management, and backend implementations. More...

Collaboration diagram for Simulation Backends:

Topics
	CPU Backends
	CPU-based simulation backends.
	Composite / Partitioned Backends
	P-block composite simulation for partitioned quantum computing.
	GPU Backends
	GPU-accelerated and distributed GPU simulation backends (cuStateVec, CUDA MPS/TN, multi-GPU and MPI clusters).

Files
file	QuantumChannel.h
	Backend-independent constructors for local CPTP quantum channels.
file	Simulator.h
file	SimulatorObserver.h
file	Factory.h
file	State.h

Detailed Description

Simulator interfaces, state management, and backend implementations.

The Simulators module provides a uniform interface to multiple quantum simulation backends. All simulators implement the Simulators::ISimulator interface and can be obtained through the Simulators::SimulatorsFactory.

Supported backends

Backend	SimulatorType	SimulationType	Accelerator
QCSim Statevector	kQCSim	kStatevector	CPU
QCSim MPS	kQCSim	kMatrixProductState	CPU
QCSim Stabilizer	kQCSim	kStabilizer	CPU
QCSim Tensor Network	kQCSim	kTensorNetwork	CPU
QCSim Pauli Propagator	kQCSim	kPauliPropagator	CPU
Qiskit Aer	kQiskitAer	SV, MPS, Stabilizer, TN, ExtStab	CPU
GPU Statevector	kGpuSim	kStatevector	GPU
GPU MPS	kGpuSim	kMatrixProductState	GPU
GPU Tensor Network	kGpuSim	kTensorNetwork	GPU
GPU Pauli Propagator	kGpuSim	kPauliPropagator	GPU
QuEST	kQuestSim	kStatevector	CPU
Composite (p-block)	kCompositeQCSim	kStatevector	CPU
Distributed GPU Statevector	kDistGpuSim	kStatevector	Multi-GPU (Local)
Distributed MPI GPU Statevector	kDistMpiGpuSim	kStatevector	MPI / Multi-Node GPU

Key classes

• Simulators::IState — quantum state management (allocation, measurement, probabilities)
• Simulators::ISimulator — gate application interface
• Simulators::SimulatorsFactory — factory for creating simulator instances
• Simulators::ISimulatorObserver — observer pattern for state changes