期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 16, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.160401
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资金
- Deutsche Forschungsgemeinschaft [SFB 652]
- Australian Research Council Centre of Excellence for Quantum Computation and Communication Technology [CE110001027]
- Ente Cassa di Risparmio di Firenze
- EU under ERA-NET CHIST-ERA project QSCALE
We propose a definition of nonclassicality for a single-mode quantum-optical process based on its action on coherent states. If a quantum process transforms a coherent state to a nonclassical state, it 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 the output state for an input thermal state. DOI: 10.1103/PhysRevLett.110.160401
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