Time-bin entangled single-photons are highly demanded for long distance quantum communication. We propose a heralded source of tunable narrowband single photons entangled in well-separated multiple temporal modes (time bins) with controllable amplitudes. The detection of a single Stokes photon generated in a cold atomic ensemble via Raman scattering of a weak write pulse heralds the preparation of one spin excitation stored within the atomic medium. A train of read laser pulses deterministically converts the atomic excitation into a single anti-Stokes photon delocalized in multi-time-bins. The waveforms of bins are well-controlled by the read pulse parameters. A scheme to measure the phase coherence across all time bins is suggested.
@article{arxiv.1411.4269,
title = {Heralded generation of single photons entangled in multiple temporal modes with controllable waveforms},
author = {Anahit Gogyan and Narek Sisakyan and Rinat Akhmedzhanov and Yuri Malakyan},
journal= {arXiv preprint arXiv:1411.4269},
year = {2014}
}