Probabilistic Cloning of Coherent States without a Phase Reference
Quantum Physics
2013-06-18 v1
Abstract
We present a probabilistic cloning scheme operating independently of any phase reference. The scheme is based solely on a phase-randomized displacement and photon counting, omitting the need for non-classical resources and non-linear materials. In an experimental implementation, we employ the scheme to clone coherent states from a phase covariant alphabet and demonstrate that the cloner is capable of outperforming the hitherto best-performing deterministic scheme. An analysis of the covariances between the output states shows that uncorrelated clones can be approached asymptotically. An intriguing feature is that the trade-off between success rate and achieved fidelity can be optimized even after the cloning procedure.
Keywords
Cite
@article{arxiv.1108.4241,
title = {Probabilistic Cloning of Coherent States without a Phase Reference},
author = {Christian R. Müller and Christoffer Wittmann and Petr Marek and Radim Filip and Christoph Marquardt and Gerd Leuchs and Ulrik L. Andersen},
journal= {arXiv preprint arXiv:1108.4241},
year = {2013}
}