Qubits and common calculations

1. Jan 20, 2013

exponent137

Qubits are mentioned for use for factorizing big numbers, for search engines, etc.
But, what about common calculations as multiplications etc?
Why they are not mentioned for this, are not appropriate or they are too less economic for use of this?

2. Jan 20, 2013

VantagePoint72

There's no advantage to using qubits for basic arithmetic operations; classical computers do such operations just as efficiently.

3. Jan 20, 2013

exponent137

This means, qubits CAN do basic arithmetic operations - because this was not mentioned anywhere.

4. Jan 20, 2013

VantagePoint72

Yes, anything you can compute with a classical computer can also be computed with a quantum computer. Certain combinations of quantum gates can be combined into classical AND, OR, etc., gates.