Abstract: Quantum image encryption is a typical problem in quantum image processing. At present, most documents are based on geometric transformations, which is encrypt images of 2n 2n size. This encryption method cannot satisfy the image of any size and cyclicity, when the number of transformations reaches a certain number image will be restored. Encryption quantum color image based on pixel scrambling is proposed. Firstly, a color image is transformed into a quantum superposition state by improve NEQR model. Then each of the pixel color scrambling, by encryption rotation gates color random rotation. At this time, quantum color image not contain any original information to complete the encryption.

Key words: image processing, quantum color image, pixel color, quantum image encryption