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Can you add two numbers with a quantum computer? In the scientific method, your observation/measurement technique should not affect the outcome. If your hypothesis deals with effect of light on bugs and every time you check on the bugs with a torch, are you not causing the experimental result you will soon observe? In other words, if you did not check with a torch, would the outcome be the same? This whole idea that a qubit could be 50% 0 or 50% 1 upon measuring and usually conveniently represented as an arrow in a sphere with the two hemispheres representing 0 and 1, what is the benefit? what is the point? Imagine this scenario: I want to add two numbers made of 2 qubits and get the result in a third qubit. Number 1 is 49% 0 and  51% 1. Number 2 is 51% 0 and 49% 1. What is the value of the third qubit? is it 50% 0 and 50% 1? is it 100% 0? is it 100% 1?  If the answer is the first case, what does it mean anyway? is the output of the two numbers I added 0 or 1? is it neither or both? wi