A generalized Mach-Zehnder-type interferometer equipped with cross-Kerr elements is proposed to convert N-photon truncated single-mode quantum states into (N+1)-mode single-photon states, which are suitable for further state manipulation by means of beam splitter arrays and ON/OFF-detections, and vice versa. Applications to the realization of unitary and non-unitary transformations, quantum state reconstruction, and quantum telemanipulation are studied.
@article{arxiv.quant-ph/0111149,
title = {Quantum state conversion by cross-Kerr interaction},
author = {J. Clausen and L. Knoell and D. -G. Welsch},
journal= {arXiv preprint arXiv:quant-ph/0111149},
year = {2016}
}