Scientific Results

Quantum process nonclassicality

Year: 2013

Authors: Rahimi-Keshari S., Kiesel T., Vogel W., Grandi S., Zavatta A., Bellini M.

Autors Affiliation: Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, University of Queensland, Brisbane QLD 4072, Australia;
Arbeitsgruppe Quantenoptik, Institut für Physik, Universität Rostock, D-18051 Rostock, Germany;
Dipartimento di Fisica dell’Università degli Studi di Milano, I-20133 Milano, Italy;
Istituto Nazionale di Ottica, INO-CNR, Largo Enrico Fermi, 6, I-50125 Firenze, Italy and Department of Physics and LENS, University of Firenze, 50019 Sesto Fiorentino, Firenze, Italy

Abstract: 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.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 110 (16)      Pages from: 160401  to: 160401

More Information: We thank Jan Sperling and Tim Ralph for helpful discussions. This work was supported by the Deutsche Forschungsgemeinschaft through SFB 652. S. R.-K. also acknowledges support from the Australian Research Council Centre of Excellence for Quantum Computation and Communication Technology (Project No. CE110001027). A. Z. and M. B. acknowledge support of Ente Cassa di Risparmio di Firenze and the EU under ERA-NET CHIST-ERA project QSCALE.
KeyWords: Coherent state; Nonclassical state; Nonclassicality; Output state; Process-based; Quantum process; Quasiprobability distributions; Thermal state, Atomic physics; Physics, Quantum theory
DOI: 10.1103/PhysRevLett.110.160401

Citations: 20
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English