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In this paper we examine the N-photon absorption properties of "N00N" states,a subclass of path entangled number states. We consider two cases. The firstinvolves the N-photon absorption properties of the ideal N00N state, one thatdoes not include spectral information. We study how the N-photon absorptionprobability of this state scales with N. We compare this to the absorptionprobability of various other states. The second case is that of two-photonabsorption for an N = 2 N00N state generated from a type II spontaneous downconversion event. In this situation we find that the absorption probability isboth better than analogous coherent light (due to frequency entanglement) andhighly dependent on the optical setup. We show that the poor production ratesof quantum states of light may be partially mitigated by adjusting the spectralparameters to improve their two-photon absorption rates. This work hasapplication to quantum imaging, particularly quantum lithography, where theN-photon absorbing process in the lithographic resist must be optimized forpractical applications.

Optimizing the Multi-Photon Absorption Properties of N00N States