为实现加密图像信息的远距离安全恢复,本文提出一种基于量子密钥分发的远距离加密计算鬼成像方案。该方案利用量子密钥对远端Alice计算鬼成像系统探测到的桶探测值进行加密,并通过长距离光纤量子信道发送给本端Bob,在本端解密后与通过经典信道获得的散斑图进行关联计算,恢复出待测物体图像。实验结果表明:在原始密钥错误率4.75％的情况下,恢复图像的均方误差为0.10、峰值信噪比为9.96 dB。采用纠错处理后,密钥错误率降至1％,恢复图像的均方误差为0.061,降低了40％;峰值信噪比为12.16 dB,上升了22％,获得了高质量的恢复图像。

In order to realize a long-distance secure transmission of encrypted image information,this paper proposes a long-distance computional ghost imaging encryption strategy based on quantum key distribution.The strategy utilizes quantum key to encrypt the bucket detection values obtained from the computional ghost imaging system of Alice and transmits the encrypted information to Bob via a long-distance quantum channel in an optical fiber.Then the object image can be recovered through the correlation calculation of values decrypted by Bob and the speckle pattern transmitted via a classical channel.An experiment is done to further prove the proposed encryption strategy.When the key error rate remains at 4.75％,the mean square error (MSE) and peak signal-to-noise ratio (PSNR) of the recovery image are 0.10 and 9.96 dB respectively.When error correction is applied,the key error rate drops to 1％.In this case,the MSE of the recovery is 0.061,which is reduced by 40％,and the PSNR is 12.16 dB,which increased by 22％.Obviously,the error correction processing effectively improves the quality of the recovery image.