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class qiskit.algorithms.ImaginaryEvolver

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Deprecated: Interface for Quantum Imaginary Time Evolution.

The ImaginaryEvolver interface has been superseded by the qiskit.algorithms.time_evolvers.ImaginaryTimeEvolver interface. This interface will be deprecated in a future release and subsequently removed after that.

Deprecated since version 0.24.0

The class qiskit.algorithms.evolvers.imaginary_evolver.ImaginaryEvolver is deprecated as of qiskit 0.24.0. It will be removed no earlier than 3 months after the release date. Instead, use the interface qiskit.algorithms.time_evolvers.ImaginaryTimeEvolver. See in a new tab) for a migration guide.



abstract evolve(evolution_problem)

Perform imaginary time evolution exp(τH)Ψ\exp(-\tau H)|\Psi\rangle.

Evolves an initial state Ψ|\Psi\rangle for an imaginary time τ\tau under a Hamiltonian HH, as provided in the evolution_problem.


evolution_problem (EvolutionProblem) – The definition of the evolution problem.


Evolution result which includes an evolved quantum state.

Return type


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