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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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
Issue number1
Pages (from-to)010305
Publication statusPublished - 2012

Bibliographical note

©2012 American Physical Society


  • Mathematical models
  • Physics
  • Cloning

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