  We report for the first time in an ancilla-free process a non-local
entanglement between two single photons which do not meet. For our experiment
we derive a simple and efficient method to entangle two single photons using
post-selection technology. The photons are guided into an interferometer setup
without the need for ancilla photons for projection into the Bell-states. After
passing the output ports, the photons are analyzed using a bell state analyzer
on each side. The experimental data clearly shows a non-local interaction
between these photons, surpassing the limit set by the CHSH-inequality with an
S-value of 2.54 and 24 standard deviations.
