Light fields can be amplified by measuring the field amplitude reflected at a beam splitter of reflectivity R and adding a coherent amplitude proportional to the measurement result to the transmitted field. By applying the quantum optical realization of this amplification scheme to single photon inputs, it is possible to clone the polarization states of photons. We show that optimal cloning of single photon polarization is possible when the gain factor of the amplification is equal to the inverse squareroot of 1-R.
@article{arxiv.quant-ph/0512002,
title = {Optimal cloning of single photon polarization by coherent feedback of beam splitter losses},
author = {Holger F. Hofmann and Toshiki Ide},
journal= {arXiv preprint arXiv:quant-ph/0512002},
year = {2007}
}
Comments
10 pages, including 1 figure, extended from letter to full paper, to be published in New Journal of Physics