Some problems remain such as the difficulty to produce NOON states with high power, but they are very promising anyway.
So far they devised how to make ingenious conditional measurements in order to generate NOON states.
Another important topic was the emulation of non-linear effects by conditional measurements within linear optics .
- J Dowling arXiv:0904.0163
- G. G. Lapaire1, et al, Conditional linear-optical measurement schemes generate effective photon nonlinearities DOI: 10.1103/PhysRevA.68.042314
- Jonathan Dowling ppt presentation
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