  Quantum Entanglement is widely regarded as one of the most prominent features
of quantum mechanics and quantum information science. Although, photonic
entanglement is routinely studied in many experiments nowadays, its signature
has been out of the grasp for real-time imaging. Here we show that modern
technology, namely triggered intensified charge coupled device (ICCD) cameras
are fast and sensitive enough to image in real-time the effect of the
measurement of one photon on its entangled partner. To quantitatively verify
the non-classicality of the measurements we determine the detected photon
number and error margin from the registered intensity image within a certain
region. Additionally, the use of the ICCD camera allows us to demonstrate the
high flexibility of the setup in creating any desired spatial-mode
entanglement, which suggests as well that visual imaging in quantum optics not
only provides a better intuitive understanding of entanglement but will improve
applications of quantum science.
