Heralded quantum steering over a high-loss channel

Morgan M. Weston, Sergei Slussarenko, Helen M. Chrzanowski, Sabine Wollmann, Lynden K. Shalm, Varun B. Verma, Michael S. Allman, Sae Woo Nam, Geoff J. Pryde*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

29 Citations (Scopus)
287 Downloads (Pure)


Entanglement is the key resource for many long-range quantum information tasks, including secure communication and fundamental tests of quantum physics. These tasks require robust verification of shared entanglement, but performing it over long distances is presently technologically intractable because the loss through an optical fiber or free-space channel opens up a detection loophole. We design and experimentally demonstrate a scheme that verifies entanglement in the presence of at least 14.8 ± 0.1 dB of added loss, equivalent to approximately 80 km of telecommunication fiber. Our protocol relies on entanglement swapping to herald the presence of a photon after the lossy channel, enabling event-ready implementation of quantum steering. This result overcomes the key barrier in device-independent communication under realistic high-loss scenarios and in the realization of a quantum repeater.

Original languageEnglish
Article numbere1701230
Number of pages7
JournalScience Advances
Issue number1
Early online date5 Jan 2018
Publication statusPublished - Jan 2018

Structured keywords

  • QETLabs


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