Figure 5: Perfect state transfer of entangled states with varying purity.
From: Experimental perfect state transfer of an entangled photonic qubit
Photon 1 of the state 
is injected into waveguide 1 of the PST array. A delay is applied to the vertical component to control the purity of the state. (a) Relative delay of 0 μm, (b) 50 μm, (c) 100 μm and (d) 150 μm. Results have had the small imaginary components removed for brevity.
