Measurement-based noiseless linear amplification for quantum communication

Chrzanowski, Helen M., Walk, Nathan, Assad, Syed M., Janousek, Jiri, Hosseini, Sara, Ralph, Timothy C., Symul, Thomas and Lam, Ping Koy (2014) Measurement-based noiseless linear amplification for quantum communication. Nature Photonics, 8 4: 333-338. doi:10.1038/nphoton.2014.49

Author Chrzanowski, Helen M.
Walk, Nathan
Assad, Syed M.
Janousek, Jiri
Hosseini, Sara
Ralph, Timothy C.
Symul, Thomas
Lam, Ping Koy
Title Measurement-based noiseless linear amplification for quantum communication
Journal name Nature Photonics   Check publisher's open access policy
ISSN 1749-4885
Publication date 2014-04
Year available 2014
Sub-type Article (original research)
DOI 10.1038/nphoton.2014.49
Open Access Status
Volume 8
Issue 4
Start page 333
End page 338
Total pages 6
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Collection year 2015
Language eng
Abstract Entanglement distillation is an indispensable ingredient in extended quantum communication networks. Distillation protocols are necessarily non-deterministic and require advanced experimental techniques such as noiseless amplification. Recently, it was shown that the benefits of noiseless amplification could be extracted by performing a post-selective filtering of the measurement record to improve the performance of quantum key distribution. We apply this protocol to entanglement degraded by transmission loss of up to the equivalent of 100 km of optical fibre. We measure an effective entangled resource stronger than that achievable by even a maximally entangled resource passively transmitted through the same channel. We also provide a proof-of-principle demonstration of secret key extraction from an otherwise insecure regime. The measurement-based noiseless linear amplifier offers two advantages over its physical counterpart: ease of implementation and near-optimal probability of success. It should provide an effective and versatile tool for a broad class of entanglement-based quantum communication protocols.
Keyword Quantum communication
Entanglement distillation
Noiseless amplification
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2015 Collection
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Citation counts: TR Web of Science Citation Count  Cited 25 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 26 times in Scopus Article | Citations
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