Tomographic reconstruction of the single-photon Fock state by high-frequency homodyne detection

Year: 2004

Authors: Zavatta A., Viciani S., Bellini M.

Autors Affiliation: Istituto Nazionale di Ottica Applicata (INOA), Largo E. Fermi 6, 50125 Firenze, Italy

Abstract: A single-photon Fock state has been generated by means of conditional preparation from a two-photon state emitted in the process of spontaneous parametric down-conversion. A recently developed high-frequency homodyne tomography technique has been used to completely characterize the Fock state by means of a pulse-to-pulse analysis of the detectors\’ difference photocurrent. The density matrix elements of the generated state have been retrieved with a final detection efficiency of about 57%. A comparison has been performed between the phase-averaged tomographic reconstructions of the Wigner function as obtained from the measured density-matrix elements and from a direct Abel transform of the homodyne data. The ability of our system to work at the full repetition rate of the pulsed laser (82 MHz) substantially simplifies the detection scheme, allowing for more \”exotic\” quantum states to be generated and analyzed.

Journal/Review: PHYSICAL REVIEW A

Volume: 70 (5)      Pages from: 053821-1  to: 053821-6

More Information: Ministero dell’Istruzione, dell’Università e della Ricerca, MIUR. RBNE01KZ94. – JOBOFD 1464-4266 6 , S556 ( 2004 ). 10.1088/1464-4266/6/6/014 This work has been performed within the framework of the “Spettroscopia Laser e Ottica Quantistica” project of the Department of Physics of the University of Florence and partially supported by the Italian Ministry of University and Scientific Research (MIUR), under the FIRB Contract No. RBNE01KZ94. The authors would also like to thank P. Poggi of the electronic workshop at INOA for the skillful implementation of the high-frequency detection electronics.
KeyWords: Bandwidth; Functions; Integral equations; Laser beam effects; Mathematical models; Natural frequencies; Photocurrents; Photons; Remote sensing; Spurious signal noise; Tomography; Vacuum, Fock state; Pulse-to-pulse analysis; Quantum tomography; Wigner functions (WF), Quantum theory; quantum homodyne tomography
DOI: 10.1103/PhysRevA.70.053821

Citations: 103
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