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arXiv · 1108.4241

Probabilistic Cloning of Coherent States without a Phase Reference

Christian R. Müller·Christoffer Wittmann·Petr Marek·Radim Filip·Christoph Marquardt·Gerd Leuchs·Ulrik L. Andersen
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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.

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Christian R. Müller, Christoffer Wittmann, Petr Marek, Radim Filip, Christoph Marquardt, Gerd Leuchs, Ulrik L. Andersen. 2011-08-22. Probabilistic Cloning of Coherent States without a Phase Reference. https://doi.org/10.1103/physreva.86.010305

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