Entangled photon pairs, absorption

The crucial prerequisite of quantum Uthography is simultaneous absorption of N correlated photons in an N-photon absorbing material. We will discuss TPA of entangled photon pairs along the lines pursued in the literature [71-73]. Entangled photon absorption is often explained by com-... 

Dependencies of the absorption rates on the irradiation area at a constant pair arrival rate of 10 MHz are shown in Fig. 18. Here R2 and Re exhibit different slopes. For areas larger than a certain critical value (which corresponds to the critical flux density, and in this case is very close to the area with diameter of 0.8 pm), the entangled photon TPA dominates the classical TPA. However,... 

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