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Experimental Study of Nonclassical Teleportation Beyond Average Fidelity

Research output: Contribution to journalArticle

Original languageEnglish
Article number140501
Number of pages6
JournalPhysical Review Letters
Volume121
Issue number14
Early online date1 Oct 2018
DOIs
DateAccepted/In press - 14 Sep 2018
DateE-pub ahead of print - 1 Oct 2018
DatePublished (current) - 5 Oct 2018

Abstract

Quantum teleportation establishes a correspondence between an entangled state shared by two separate parties that can communicate classically and the presence of a quantum channel connecting the two parties. The standard benchmark for quantum teleportation, based on the average fidelity between the input and output states, indicates that some entangled states do not lead to channels which can be certified to be quantum. It was recently shown that if one considers a finer-grained witness, then all entangled states can be certified to produce a non-classical teleportation channel. Here we experimentally demonstrate a complete characterization of a new family of such witnesses, of the type proposed in Phys. Rev. Lett. 119, 110501 (2017) under different conditions of noise. We report non-classical teleportation using quantum states that can not achieve average fidelity of teleportation above the classical limit. We further use the violation of these witnesses to estimate the negativity of the shared state. Our results have fundamental implications in quantum information protocols and may also lead to new applications and quality certification of quantum technologies.

    Structured keywords

  • Bristol Quantum Information Institute
  • QITG

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    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via APS at https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.121.140501 . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 879 KB, PDF document

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