Youtube hearted comments of kazedcat (@kazedcat).

  1. There is no way to determine if a particle is entangled or not. The only way to know if two particles are entangled is by comparing the result of their individual measurements. If you performed the entanglement then you can be sure with high probability that two particles are entangled but not 100% because there is always a small chance of decoherence. Decoherence is the event where two entangled particles stop being entangledl Decoherence alone is enough to prevent FTL communication but usually we assume QEC can isolate the particle enough that the chance of decoherence is very low.
    2
  2. Completely different. Silicon interposer is a packaging technology while backside power delivery is a microchip production technology.
    2