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EOH

EOH(operator, initial_state, evo_operator, evo_time=1, num_time_slices=1, expansion_mode='trotter', expansion_order=1, quantum_instance=None) GitHub(opens in a new tab)

The Quantum EOH (Evolution of Hamiltonian) algorithm.

EOH provides the lower-level building blocks for simulating universal quantum systems. For any given quantum system that can be decomposed into local interactions (for example, a global hamiltonian as the weighted sum of several Pauli spin operators), the local interactions can then be used to approximate the global quantum system via, for example, Lloyd’s method or Trotter-Suzuki decomposition.

Parameters

  • operator (LegacyBaseOperator) – Operator to evaluate
  • initial_state (InitialState) – Initial state for evolution
  • evo_operator (LegacyBaseOperator) – Operator to evolve
  • evo_time (float) – Evolution time, has min value of 0
  • num_time_slices (int) – Number of time slices, has minimum value of 1
  • expansion_mode (str) – Either "trotter" (Lloyd’s method) or "suzuki" (for Trotter-Suzuki expansion)
  • expansion_order (int) – The Trotter-Suzuki expansion order.
  • quantum_instance (Union[QuantumInstance, BaseBackend, None]) – Quantum Instance or Backend

Attributes

backend

qiskit.providers.basebackend.BaseBackend

Returns backend.

Return type

BaseBackend

quantum_instance

Union[None, qiskit.aqua.quantum_instance.QuantumInstance]

Returns quantum instance.

Return type

Optional[QuantumInstance]

random

Return a numpy random.


Methods

construct_circuit

EOH.construct_circuit()

Construct the circuit.

Returns

the circuit.

Return type

QuantumCircuit

run

EOH.run(quantum_instance=None, **kwargs)

Execute the algorithm with selected backend.

Parameters

Returns

results of an algorithm.

Return type

dict

Raises

AquaError – If a quantum instance or backend has not been provided

set_backend

EOH.set_backend(backend, **kwargs)

Sets backend with configuration.

Return type

None

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