Authors
Jing Yan Haw, Jie Zhao, Josephine Dias, Syed M Assad, Mark Bradshaw, Rémi Blandino, Thomas Symul, Timothy C Ralph, Ping Koy Lam
Publication date
2016/10/26
Journal
Nature communications
Volume
7
Issue
1
Pages
13222
Publisher
Nature Publishing Group UK
Description
The no-cloning theorem states that an unknown quantum state cannot be cloned exactly and deterministically due to the linearity of quantum mechanics. Associated with this theorem is the quantitative no-cloning limit that sets an upper bound to the quality of the generated clones. However, this limit can be circumvented by abandoning determinism and using probabilistic methods. Here, we report an experimental demonstration of probabilistic cloning of arbitrary coherent states that clearly surpasses the no-cloning limit. Our scheme is based on a hybrid linear amplifier that combines an ideal deterministic linear amplifier with a heralded measurement-based noiseless amplifier. We demonstrate the production of up to five clones with the fidelity of each clone clearly exceeding the corresponding no-cloning limit. Moreover, since successful cloning events are heralded, our scheme has the potential to be adopted in …
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