Optimally cloned binary coherent states

C. R. Mueller, G. Leuchs, Ch Marquardt, Ulrik Lund Andersen

Research output: Contribution to journalJournal articleResearchpeer-review

286 Downloads (Pure)


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)
Issue number4
Number of pages11
Publication statusPublished - 2017

Bibliographical note

©2017 American Physical Society

Cite this