Quantum Imaging and Generation of multi-partite entangeled states by projective measurements
Prof. Dr. Joachim von Zanthier (Universitaet Erlangen)

In quantum imaging, sub-classical spatial resolution has been achieved so far using entangled photons in combination with multi-photon absorbers. Here we present a different method, employing photons spontaneously emitted from uncorrelated single photon sources and using linear optical tools only. In particular, we demonstrate that the detection of N photons by N detectors in the far field can produce a spatial resolution of lambda/N with 100 % contrast. The method relies on multiphoton interferences displayed in the Nth order correlation function of the radiated field. Moreover, as the detection of the photons leaves the emitters in particular entangled states this can be exploited to form a large variety of long-lived entangled states within the same experimental setup.