量子图像加密是量子图像处理中的典型问题。目前,大多数相关研究基于某种几何 变换,针对2n×2n尺寸的图像进行加密。这种加密方法不能满足任意大小尺寸的图像且加密具有周期性,即当变 换次数达到某个值时,加密图像就会恢复。基于像素颜色置乱提出了一种新的加密方法。所提方法 采用改进的NEQR模型表示彩色量子图像,对像素颜色进行置乱,通过改进的量子旋转 门把描述颜色的量子比特随机旋转,使原始图像不包含自身信息,达到加密的效果。

Quantum image encryption is a typical problem in quantum image processing. At present, most documents are based on geometric transformations, which is used to encrypt images of 2n×2n size. This encryption method cannot satisfy the image of any size and is of obvious cyclicity. When the number of transformations reaches a certain number, the image will be restored. Based on scrambling of pixels, a new encryption method is proposed. An improved NEQR model is used to represent quantum color images, then the pixel are scrambled. Random rotation to each of the pixels is carried out by a quantum revolving gate. Then, the image is encrypted and not contained any original information.