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Experimental Ten-Photon Entanglement.

Xi-Lin Wang1, Luo-Kan Chen1, W Li1

  • 1Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China, CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics, Hefei, Anhui 230026, China, and CAS-Alibaba Quantum Computing Laboratory, Shanghai, 201315, China.

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This summary is machine-generated.

Researchers demonstrated quantum entanglement with ten single photons, a major advance for quantum information processing. This breakthrough enables new possibilities for quantum computing and secure communication technologies.

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Area of Science:

  • Quantum Physics
  • Quantum Information Science

Background:

  • Generating and controlling multi-photon entangled states is crucial for advancing quantum technologies.
  • Previous experiments have faced limitations in scalability and efficiency for creating complex entangled states.

Purpose of the Study:

  • To experimentally demonstrate quantum entanglement involving ten spatially separated single photons.
  • To develop a high-performance entangled photon-pair source for multi-photon experiments.
  • To establish a platform for advanced optical quantum information tasks.

Main Methods:

  • Development of a near-optimal entangled photon-pair source with high brightness (~12 MHz/W), collection efficiency (~70%), and indistinguishability (~91%).
  • Step-by-step engineering of multi-photon entanglement using the developed source.
  • Characterization of the ten-photon state fidelity to confirm genuine multi-particle entanglement.

Main Results:

  • First experimental demonstration of quantum entanglement among ten spatially separated single photons.
  • Achieved a ~2 orders of magnitude increase in the ten-photon count rate compared to prior work at 0.57 W pump power.
  • Maintained high state fidelity, sufficient for proving genuine ten-particle entanglement.

Conclusions:

  • The study presents a state-of-the-art platform for multi-photon experiments.
  • Enabled technologies for challenging optical quantum information tasks, including Shor's error correction code and scattershot boson sampling.
  • Paves the way for future advancements in quantum computing and quantum communication.