Surpassing the no-cloning limit with a heralded hybrid linear amplifier for coherent states

Jing Yan Haw, Jie Zhao, Josephine Dias, Syed M. Assad, Mark Bradshaw, Rémi Blandino, Thomas Symul, Timothy C. Ralph and Ping Koy Lam ()
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Jing Yan Haw: Centre for Quantum Computation and Communication Technology, Research School of Physics and Engineering, The Australian National University
Jie Zhao: Centre for Quantum Computation and Communication Technology, Research School of Physics and Engineering, The Australian National University
Josephine Dias: Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, University of Queensland
Syed M. Assad: Centre for Quantum Computation and Communication Technology, Research School of Physics and Engineering, The Australian National University
Mark Bradshaw: Centre for Quantum Computation and Communication Technology, Research School of Physics and Engineering, The Australian National University
Rémi Blandino: Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, University of Queensland
Thomas Symul: Centre for Quantum Computation and Communication Technology, Research School of Physics and Engineering, The Australian National University
Timothy C. Ralph: Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, University of Queensland
Ping Koy Lam: Centre for Quantum Computation and Communication Technology, Research School of Physics and Engineering, The Australian National University

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract 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 quantum repeater, teleportation and computing applications.

Date: 2016
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DOI: 10.1038/ncomms13222

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