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---
title: ImaginaryTimeEvolver
description: API reference for qiskit.algorithms.ImaginaryTimeEvolver
in_page_toc_min_heading_level: 1
python_api_type: class
python_api_name: qiskit.algorithms.ImaginaryTimeEvolver
---
# ImaginaryTimeEvolver
<Class id="qiskit.algorithms.ImaginaryTimeEvolver" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.23/qiskit/algorithms/time_evolvers/imaginary_time_evolver.py" signature="ImaginaryTimeEvolver" modifiers="class">
Bases: `abc.ABC`
Interface for Quantum Imaginary Time Evolution.
## Methods
### evolve
<Function id="qiskit.algorithms.ImaginaryTimeEvolver.evolve" signature="ImaginaryTimeEvolver.evolve(evolution_problem)" modifiers="abstract">
Perform imaginary time evolution $\exp(-\tau H)|\Psi\rangle$.
Evolves an initial state $|\Psi\rangle$ for an imaginary time $\tau$ under a Hamiltonian $H$, as provided in the `evolution_problem`.
**Parameters**
**evolution\_problem** ([`TimeEvolutionProblem`](qiskit.algorithms.TimeEvolutionProblem "qiskit.algorithms.time_evolvers.time_evolution_problem.TimeEvolutionProblem")) The definition of the evolution problem.
**Return type**
[`TimeEvolutionResult`](qiskit.algorithms.TimeEvolutionResult "qiskit.algorithms.time_evolvers.time_evolution_result.TimeEvolutionResult")
**Returns**
Evolution result which includes an evolved quantum state.
</Function>
</Class>