Science Advances

Supplementary Materials

This PDF file includes:

  • section S1. Entanglement witness for W-type states
  • section S2. Experimental measurement of the entanglement witness
  • section S3. Discussion of the experimental noise
  • fig. S1. Coupling configuration for the measurement of the retrieval efficiency of each micro-ensemble.
  • fig. S2. Coupling configuration for the measurement of the excitation population of each micro-ensemble.
  • fig. S3. Coupling configuration for the measurement of the W-state fidelity.
  • fig. S4. Measurement of the three-photon correlation and the double excitation probability.

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