We can encode an image from an orthogonal basis set onto a single photon from a downconverted pair via the use of an amplitude mask. We can then discriminate the image imprinted on the photon from other images in the set using holographic-matched filtering techniques. We demonstrate this procedure experimentally for an image space of two objects, and we discuss the possibility of applying this method to a much larger image space. This process could have important implications for the manipulation of images at the quantum level.
C. J. Broadbent, P. Zerom, H. Shin, J. C. Howell, and R. W. Boyd, Discriminating Orthogonal Single-Photon Images, Phys. Rev. A 79(3), 033802. https://doi.org/10.1103/PhysRevA.79.033802
American Physical Society