Undoing the effect of loss on quantum entanglement

Ulanov, Alexander E., Fedorov, Ilya A., Pushkina, Anastasia A., Kurochkin, Yury V., Ralph, Timothy C. and Lvovsky A.I. (2015) Undoing the effect of loss on quantum entanglement. Nature Photonics, 9 11: 764-768. doi:10.1038/nphoton.2015.195

Author Ulanov, Alexander E.
Fedorov, Ilya A.
Pushkina, Anastasia A.
Kurochkin, Yury V.
Ralph, Timothy C.
Lvovsky A.I.
Title Undoing the effect of loss on quantum entanglement
Journal name Nature Photonics   Check publisher's open access policy
ISSN 1749-4893
Publication date 2015-10-29
Year available 2015
Sub-type Article (original research)
DOI 10.1038/nphoton.2015.195
Open Access Status Not yet assessed
Volume 9
Issue 11
Start page 764
End page 768
Total pages 5
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Collection year 2016
Language eng
Abstract Entanglement distillation, the purpose of which is to probabilistically increase the strength and purity of quantum entanglement, is a primary element of many quantum communication and computation protocols. It is particularly necessary in quantum repeaters in order to counter the degradation of entanglement that inevitably occurs due to losses in communication lines. Here, we distil the Einstein–Podolsky–Rosen state of light, the workhorse of continuous-variable entanglement, using noiseless amplification. The advantage of our technique is that it permits recovering a macroscopic level of entanglement, however low the initial entanglement or however high the loss may be. Experimentally, we recover the original entanglement level after one of the Einstein–Podolsky–Rosen modes has experienced a loss factor of 20. The level of entanglement in our distilled state is higher than that achievable by direct transmission of any state through a similar loss channel. This is a key step towards realizing practical continuous-variable quantum communication protocols.
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 2016 Collection
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Citation counts: TR Web of Science Citation Count  Cited 5 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 4 times in Scopus Article | Citations
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