According to Wikipedia, quantum computing is to perform operations on data by using computation device that use quantum mechanical phenomena such as superposition and entanglement. furthermore, as stated by Bone. S (n.d.) the computer used to have bit numbers which were 0 and 1. however in quantum computer, it is not only quantum bit, but also qubit. if the processor is able to register through qubits, it will perform calculations by using all the values of the input registers simutaneously. it is called as quantum parallelism.
According to Mike (2009), there are advantages and disadvantages of quantum computing. the advantages of quantum computing are much powerful, faster, smaller, improvement to science, and can improve on practical personal electronics. on the contrast, the disadvantages of quantum computing are hard to control quantum particles, lots of heat, expensive, difficult to build and not enough is known about quantum mechanics.
References
http://mkaciban.blogspot.com/2009/05/quantum-computing-advantages-and.html
http://en.wikipedia.org/wiki/Quantum_computer
http://www.doc.ic.ac.uk/~nd/surprise_97/journal/vol1/spb3/
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