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Experimental sample-efficient and device-independent GHZ state certification.

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Summary
This summary is machine-generated.

We developed a new method for certifying quantum resources, enabling device-independent verification of quantum states with few copies and non-IID data. This advances secure quantum information processing.

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Area of Science:

  • Quantum Information Science
  • Quantum Cryptography
  • Quantum Computing

Background:

  • Quantum resource certification is crucial for secure quantum information processing.
  • Device-independent (DI) self-testing methods are used for verification but often require many samples (asymptotic, IID).
  • Existing DI methods face limitations in practical experimental implementation due to sample requirements.

Purpose of the Study:

  • To overcome limitations of asymptotic and IID assumptions in device-independent quantum state verification.
  • To enable robust quantum state certification using a minimal number of quantum resource copies.
  • To demonstrate efficient and device-independent certification of multipartite entangled states.

Main Methods:

  • Developed a theoretical protocol for quantum state certification in the few-copies and non-IID regime.
  • Utilized a high-fidelity multipartite entangled photon source for experimental implementation.
  • Applied device-independent self-testing principles to a single copy of a quantum state.

Main Results:

  • Successfully demonstrated efficient and device-independent certification of a four-qubit Greenberger-Horne-Zeilinger (GHZ) state.
  • Overcame the challenges posed by few-copy and non-IID data requirements in quantum verification.
  • Showcased the practical feasibility of DI quantum state certification.

Conclusions:

  • The developed protocol enables reliable quantum state verification under realistic experimental conditions.
  • This work paves the way for robust and trustworthy quantum information processing applications.
  • Efficient DI certification of quantum states is achievable, enhancing the security of quantum technologies.