This PDF file includes:

• Supplementary Materials and Methods
  
• Supplementary Text
  
• fig. S1. Design of photonic synapse.
  
• fig. S2. Optical measurement scheme.
  
• fig. S3. Optical field distribution in photonic synapses.
  
• fig. S4. Optical field distributions in S2 and synapse-mimic designs.
  
• fig. S5. Full trace of five-level weighting.
  
• fig. S6. Eleven-level weighting.
  
• table S1. Dimensions of photonic synapses.
  
• table S2. Fitting of synaptic weight on pulse number.
  
• References (32–34)

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