Probabilistic cloning of coherent states without a phase reference

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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DOI

  • Author: Müller, Christian R.

    Max Planck Institute for the Science of Light, Germany

  • Author: Wittmann, Christoffer

    Max Planck Institute for the Science of Light, Germany

  • Author: Marek, Petr

    Department of Optics, Palacký University, Czech Republic

  • Author: Filip, Radim

    Department of Optics, Palacký University, Czech Republic

  • Author: Marquardt, Christoph

    Department of Physics, University of Erlangen-Nuremberg, Germany

  • Author: Leuchs, Gerd

  • Author: Andersen, Ulrik L.

    Quantum physics and information technology, Department of Physics, Technical University of Denmark, Denmark

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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 nonclassical resources and nonlinear 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. This simultaneously demonstrates how the effect of loss on coherent states can be compensated via noiseless preamplification.
Original languageEnglish
JournalPhysical Review A (Atomic, Molecular and Optical Physics)
Publication date2012
Volume86
Issue1
Pages010305
ISSN1050-2947
DOIs
StatePublished

Bibliographical note

©2012 American Physical Society

CitationsWeb of Science® Times Cited: 5

Keywords

  • Mathematical models, Physics, Cloning
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