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Related Experiment Video

Updated: Jan 20, 2026

Molecular Entanglement and Electrospinnability of Biopolymers
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Experimental few-copy multi-particle entanglement detection.

Valeria Saggio1, Aleksandra Dimić2, Chiara Greganti1,3

  • 1Vienna Center for Quantum Science and Technology (VCQ), Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria.

Nature Physics
|September 6, 2019
PubMed
Summary
This summary is machine-generated.

We developed an efficient method to detect quantum entanglement, crucial for verifying quantum technologies. This technique requires fewer quantum state copies, making large-scale quantum device verification more practical.

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Experimental Quantum Physics

Background:

  • Future quantum technologies depend on generating entangled quantum states.
  • Verifying quantum entanglement in large-scale quantum systems is a significant challenge.
  • Existing entanglement detection methods require numerous measurement settings.

Purpose of the Study:

  • To develop a generic framework for efficient quantum entanglement detection.
  • To translate entanglement witnesses into resource-efficient probabilistic schemes.
  • To enable practical verification of large-scale quantum devices.

Main Methods:

  • Developed a probabilistic entanglement detection scheme based on any entanglement witness.
  • Confidence in detection grows exponentially with the number of quantum state copies.
  • Experimentally verified entanglement in a photonic six-qubit cluster state.

Main Results:

  • Entanglement certified with >99.74% confidence using just 20 copies of the quantum state.
  • Genuine six-qubit entanglement verified with >99% confidence using 112 copies.
  • Protocol demonstrated effectiveness with few copies and in the presence of imperfections.

Conclusions:

  • The proposed framework offers a practical and resource-efficient method for entanglement detection.
  • Enables reliable verification of large-scale quantum devices and future quantum technologies.
  • Addresses a key bottleneck in the advancement of quantum information processing.