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Frontiers in Optics

Generation and Tomographic Analysis of Temporally-delocalized Single Photons

Alessandro Zavatta, Valentina Parigi, Milena D’Angelo, Marco Bellini

Published Jan 1, 2006• 0 citations
Publisher

Abstract

We report the experimental coherent delocalization of a single photon between two distinct temporal modes. Dual-mode quantum homodyne tomography is used to analyze the state and test for the violation of a Bell’s-type inequality.
DOI
10.1364/ls.2006.ltud1

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We have developed a technique for dual-temporal-mode, ultrafast, time-domain, balanced homodyne detection. We have tested it by performing homodyne measurements on pairs of picosecond-duration temporal modes (or “time bins”) carrying a delocalized single photon. The experimental homodyne data have been used to reconstruct both the density matrix and the two-mode Wigner function of the delocalized state, thus showing the correlations existing between the pair of temporal modes carrying the single photon.
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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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