Optimally cloned binary coherent states

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Binary coherent state alphabets can be represented in a two-dimensional Hilbert space. We capitalize this formal connection between the otherwise distinct domains of qubits and continuous variable states to map binary phase-shift keyed coherent states onto the Bloch sphere and to derive their quantum-optimal clones. We analyze the Wigner function and the cumulants of the clones, and we conclude that optimal cloning of binary coherent states requires a nonlinearity above second order. We propose several practical and near-optimal cloning schemes and compare their cloning fidelity to the optimal cloner.
Original languageEnglish
Article number042311
JournalPhysical Review A (Atomic, Molecular and Optical Physics)
Volume96
Issue number4
Number of pages11
ISSN2469-9926
DOIs
Publication statusPublished - 2017

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©2017 American Physical Society

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