Quantum entanglement

• How Is MPS Bond Dimension Related to Entanglement?
  An MPS bond of dimension D limits the Schmidt rank across its cut to D and the entanglement entropy to log D, but need not saturate either bound.
• Can a Digital Computer Simulate Quantum Entanglement to Any Precision?
  A classical digital computer can approximate entangled quantum systems to arbitrary precision in principle, but general simulations can require exponential resources.
• Are Electromagnetic Waves the Only Way to Transmit Information?
  No. Sound, mechanical motion, particles, and other physical signals can carry information; relativity limits causal signaling to at most light speed in vacuum.