Abstract
This paper firstly introduces quantum computing theory into the study of granular computing, then puts forward a new granular computing model based on quantum computing theory, which fully makes full use of the parallelism of quantum computing and layered characteristics of the granular computing. As Grover quantum algorithm has some shortcomings in the classical target number of solutions to solve more problems in the search space, this paper further puts forward an improved Grover quantum search algorithm, and experiment results show it is effective.