Scientific Results

Experimental generation and characterization of single-photon hybrid ququarts based on polarization and orbital angular momentum encoding

Year: 2010

Authors: Nagali E., Sansoni L., Marrucci L., Santamato E., Sciarrino F.

Autors Affiliation: Dipartimento di Fisica, Sapienza Università di Roma, Roma I-00185, Italy; Dipartimento di Scienze Fisiche, Università di Napoli “Federico II”, Complesso Universitario di Monte S. Angelo, I-80126 Napoli, Italy; CNR-SPIN, Coherentia, Complesso Universitario di Monte S. Angelo, I-80126 Napoli, Italy; Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, I-80126 Napoli, Italy; Istituto Nazionale di Ottica, Largo Fermi 6, I-50125 Firenze, Italy

Abstract: High-dimensional quantum states, or qudits, represent a promising resource in the quantum information field. Here we present the experimental generation of four-dimensional quantum states, or ququarts, encoded in the polarization and orbital angular momentum of a single photon. Our technique, based on the q-plate device, allows the ququart to be prepared and measured in all five mutually unbiased bases. We report the reconstruction of the four-dimensional density matrix through the tomographic procedure for different ququart states.

Journal/Review: PHYSICAL REVIEW A

Volume: 81 (5)      Pages from: 052317  to: 052317

More Information: E.N. and F. S. acknowledge support by the FARI project and Finanziamento Ateneo 2009 of Sapienza Universita di Roma.
DOI: 10.1103/PhysRevA.81.052317

Citations: 59
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English