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Proceedings Paper

Measurement-based noiseless linear amplification for quantum communication
Author(s): H. M. Chrzanowski; N. Walk; J. Y. Haw; O. Thearle; S. M. Assad; J. Janousek; S. Hosseini; T. C. Ralph; T. Symul; P. K. Lam
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Paper Abstract

Entanglement distillation is an indispensable ingredient in extended quantum communication networks. Distillation protocols are necessarily non-deterministic and require non-trivial experimental techniques such as noiseless amplification. We show that noiseless amplification could be achieved by performing a post-selective filtering of measurement outcomes. We termed this protocol measurement-based noiseless linear amplification (MBNLA). We apply this protocol to entanglement that suffers transmission loss of up to the equivalent of 100km of optical fibre and show that it is capable of distilling entanglement to a level stronger than that achievable by transmitting a maximally entangled state through the same channel. We also provide a proof-of-principle demonstration of secret key extraction from an otherwise insecure regime via MBNLA. Compared to its physical counterpart, MBNLA not only is easier in term of implementation, but also allows one to achieve near optimal probability of success.

Paper Details

Date Published: 18 November 2014
PDF: 9 pages
Proc. SPIE 9269, Quantum and Nonlinear Optics III, 926902 (18 November 2014); doi: 10.1117/12.2071884
Show Author Affiliations
H. M. Chrzanowski, The Australian National Univ. (Australia)
N. Walk, The Univ. of Queensland (Australia)
J. Y. Haw, The Australian National Univ. (Australia)
O. Thearle, The Australian National Univ. (Australia)
S. M. Assad, The Australian National Univ. (Australia)
J. Janousek, The Australian National Univ. (Australia)
S. Hosseini, The Australian National Univ. (Australia)
T. C. Ralph, The Univ. of Queensland (Australia)
T. Symul, The Australian National Univ. (Australia)
P. K. Lam, The Australian National Univ. (Australia)
Tianjin Univ. (China)

Published in SPIE Proceedings Vol. 9269:
Quantum and Nonlinear Optics III
Qihuang Gong; Guang-Can Guo; Byoung Seung Ham, Editor(s)

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