Single-photon time-encoded ebits: remote preparation and homodyne tomography characterization

Year: 2006

Authors: D’Angelo M., Zavatta A., Parigi V., Bellini M.

Autors Affiliation: CNR – Istituto Nazionale di Ottica Applicata, CNR, Largo Enrico Fermi, 6, 50125 Firenze, Italy;
European Laboratory for Non-Linear Spectroscopy (LENS), Via Nello Carrara 1, 50019 Sesto Fiorentino (FI), Italy
Department of Physics, University of Florence, 50019 Sesto Fiorentino (FI), Italy

Abstract: We present a review of our recent studies concerning remotely prepared entangled bits (ebits) made of a single photon coherently delocalized between two well-separated temporal modes (or time bins). The preparation scheme represents a remotely tunable source for tailoring arbitrary ebits, whether maximally or non-maximally entangled, which is highly desirable for applications in quantum information technology. The remotely prepared ebit is analyzed by performing both single-mode and two-mode homodyne tomography with the ultra-fast balanced homodyne detection scheme recently developed in our lab. Beside the non-classical behavior typical of single-photon Fock states (negative values around the origin), the reconstructed two-mode Wigner function is found to be characterized by an intriguing phase and by correlations between the two distant time bins sharing the single photon.

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KeyWords: Entanglement; Homodyne detection; Quantum tomography; Single photon; Correlation methods; Information technology; Photons; Remote control; Tomography; Ultrafast phenomena, Entanglement; Homodyne detection; Quantum tomography; Single photon, Quantum theory