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Robust self-testing of the three-qubit W state

Xingyao Wu, Yu Cai, Tzyh Haur Yang, Huy Nguyen Le, Jean-Daniel Bancal, and Valerio Scarani
Phys. Rev. A 90, 042339 – Published 31 October 2014

Abstract

Self-testing is a device-independent method which can be used to determine the nature of a physical system or device, without knowing any detail of the inner mechanism or the physical dimensions of the Hilbert space of the system. The only information required comprises the number of measurements, the number of outputs of each measurement, and the statistics of each measurement. Earlier works on self-testing were restricted either to a two-party scenario or multipartite graph states. Here we construct a method to self-test the three-qubit W state and show how to extend it to other pure three-qubit states. Our bounds are robust against the inevitable experimental errors.

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  • Received 23 July 2014

DOI:https://doi.org/10.1103/PhysRevA.90.042339

©2014 American Physical Society

Authors & Affiliations

Xingyao Wu1, Yu Cai1, Tzyh Haur Yang1, Huy Nguyen Le1, Jean-Daniel Bancal1, and Valerio Scarani1,2

  • 1Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, 117543, Singapore
  • 2Department of Physics, National University of Singapore, 2 Science Drive 3, 117542, Singapore

See Also

Device-independent tomography of multipartite quantum states

Károly F. Pál, Tamás Vértesi, and Miguel Navascués
Phys. Rev. A 90, 042340 (2014)

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Vol. 90, Iss. 4 — October 2014

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