How can a quantum computer work as there will be inevitable annihilation of the superstition when the answer is

Question: How can a quantum computer work as there will be inevitable annihilation of the superstition when the answer is measured meaning that the computer may not be any more efficient than a normal one?
- Keywords:
  physics,
  subatomic,
  technology
Asked by danielcropper to Derek, Elaine, Heather, Keith, Bimpe on 26 Jun 2013.
- Heather Eyre answered on 26 Jun 2013:
  
  It’s all about the properties of the qubits. Lets say it’s an electron and it can have up spin or down spin, or both (which is the superstition you mentioned), measuring it would destroy the superstition because it would be in which ever state you just measured it in.
  
  But, all the other qubits in the sequence could still be be in superstition. And once measured it can go back to superstition.
  
  But that doesn’t help as it’d still end up as an up/down question, or 1/0 and not be any more efficient that binary.
  
  The people working on this clearly know something we don’t!

Question: How can a quantum computer work as there will be inevitable annihilation of the superstition when the answer is measured meaning that the computer may not be any more efficient than a normal one?