Coherent absorption of N00N states

Roger, Thomas and Restuccia, Sara and Lyons, Ashley and Giovannini, Daniel and Romero, Jacquiline and Jeffers, John and Padgett, Miles and Faccio, Daniele (2016) Coherent absorption of N00N states. Physical Review Letters, 117 (2). 023601. ISSN 0031-9007

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    Recent results in deeply subwavelength thickness films demonstrate coherent control and logical gate operations with both classical and single-photon light sources. However, quantum processing and devices typically involve more than one photon and nontrivial input quantum states. Here we experimentally investigate two-photon N00N state coherent absorption in a multilayer graphene film. Depending on the N00N state input phase, it is possible to selectively choose between single- or two-photon absorption of the input state in the graphene film. These results demonstrate that coherent absorption in the quantum regime exhibits unique features, opening up applications in multiphoton spectroscopy and imaging.