Scientific Results

Generation of nonclassical states from thermal radiation

Year: 2006

Authors: Parigi V., Zavatta A., Bellini M.

Autors Affiliation: CNR – Istituto Nazionale di Ottica Applicata, Largo Enrico Fermi 6, 50125 Firenze, Italy;
LENS, Via Nello Carrara 1, 50019 Sesto Fiorentino, Firenze, Italy;
Department of Physics, University of Florence, Via Nello Carrara 1, 50019 Sesto Fiorentino, Florence, Italy

Abstract: We show the experimental observation of quantum states of light exhibiting nonclassical features obtained by single photon excitation of a thermal state. Such single-photon-added thermal states are the result of the single action of the creation operator on a mixed state that can be fully described classically. They show different degree of nonclassicality depending on the mean photon number of the original thermal state. The generated state is characterized by means of ultra-fast homodyne detection which allows us to reconstruct its density matrix and Wigner function by quantum tomography. We demonstrate the nonclassical behavior of single-photon added thermal states by an analysis of the negativity of the Wigner function.

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KeyWords: Entanglement; Nonclassical quantum states; Quantum homodyne tomography; Single-photon fock states; Thermal light; Density measurement (optical); Heat radiation; Matrix algebra; Photons; Quantum theory, Nonclassical quantum states; Quantum homodyne tomography; Single-photon Fock states; Thermal light, Feature extraction
DOI: 10.1117/12.680505

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