4.8 Article

Robust Self-Testing of Multiparticle Entanglement

期刊

PHYSICAL REVIEW LETTERS
卷 127, 期 23, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.230503

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资金

  1. National Natural Science Foundation of China
  2. Chinese Academy of Sciences
  3. National Fundamental Research Program
  4. Anhui Initiative in Quantum Information Technologies
  5. Department of Defense through the Hartree Postdoctoral Fellowship in the Joint Center for Quantum Information and Computer Science (QuICS)

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This study demonstrates robust self-testing for multiphoton genuinely entangled quantum states, certifying four-photon entanglement in Greenberger-Horne-Zeilinger states and linear cluster states with fidelities of 0.957 and 0.945, respectively. By observing input-output statistics, the qualities of these entangled states with respect to realistic noise were estimated in a device-independent manner.
Quantum self-testing is a device-independent way to certify quantum states and measurements using only the input-output statistics, with minimal assumptions about the quantum devices. Because of the high demand on tolerable noise, however, experimental self-testing was limited to two-photon systems. Here, we demonstrate the first robust self-testing for multiphoton genuinely entangled quantum states. We prepare two examples of four-photon graph states, the Greenberger-Horne-Zeilinger states with a fidelity of 0.957(2) and the linear cluster states with a fidelity of 0.945(2). Based on the observed input-output statistics, we certify the genuine four-photon entanglement and further estimate their qualities with respect to realistic noise in a device-independent manner.

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