Figure 3. Correlations of two-particle N00N states undergoing Bloch oscillations.
Experimental correlation matrices Γk,l (z) at four propagation distances 0.1λB ... 0.4λB obtained with (a–d) a symmetric input state 
and (e–h) an antisymmetric input state 
. Best-fit corresponding simulations are shown along with experiments, optimized with input phase shifts of 
for the symmetric input and with 
for the antisymmetric one. The coupling coefficient C (equal to 0.48 and 0.45 cm−1 for symmetric and antisymmetric state preparation, respectively) was also determined through best-fit optimization within a range provided by a coupling-distance-dependence experiment. Non-deterministic number-resolved photon detection was achieved using fibre beam-splitters.