Qbits (con’t)

• Quantum computer is analog inside

  • Digital I/O
  • Can write the qbit state as {cos??0? + ei? sin??1?}

• • a and b are complex
    • 4 degrees of freedom
  • Require
    • Lose a degree of freedom
  • Can’t observe overall phase
    • Lose a degree of freedom
  • 2 remaining degrees define a sphere of unit radius

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