Remotely prepared single-photon time-encoded ebits: homodyne tomography characterization

Abstract We propose and experimentally verify a novel method for the remote preparation of entangled bits (ebits) made of a single photon coherently delocalized between two well-separated temporal modes. The proposed 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 studied by performing two-mode homodyne tomography with an ultra-fast time-domain balanced homodyne detection scheme recently developed in our laboratory. Acknowledgments MD thanks A. Garuccio, V.L. Lepore, Y.H. Kim, and Y.H. Shih for stimulating discussions. This work has been performed in the frame of the ‘Spettroscopia laser e ottica quantistica’ project of the Physics Department of the University of Florence and partially supported by Ente Cassa di Risparmio di Firenze, MIUR, under the FIRB contract RBNE01KZ94, and PRIN.