Abstract
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 language | English |
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Article number | 042311 |
Journal | Physical Review A (Atomic, Molecular and Optical Physics) |
Volume | 96 |
Issue number | 4 |
Number of pages | 11 |
ISSN | 2469-9926 |
DOIs | |
Publication status | Published - 2017 |