Saleh Rahimi-Keshari, Thomas Kiesel, Werner Vogel, Samuele Grandi, Alessandro Zavatta, Marco Bellini
We propose a definition of nonclassicality for a single-mode quantum-optical process based on its action on coherent states. If there exists a coherent state that is transformed by a process to a nonclassical one, the corresponding process is verified to be nonclassical. To identify nonclassical processes, we introduce a representation for quantum processes, called the process-nonclassicality quasiprobability distribution, whose negativities indicate nonclassicality of the process. Using this distribution, we derive a relation for predicting nonclassicality of the output states for a given input state. We experimentally demonstrate our method by considering the single-photon addition as a nonclassical process, and predicting nonclassicality of output state for an input thermal state.
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http://arxiv.org/abs/1302.0934
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