The biggest array of coherent qubits maged to date is eight. Information input and answer output decohere the array, plus thermal noise. Th AMD Athlon 64 FX-60 CPU has 233 million transistors.
A quantum CPU will not be in the stores by Christmas. OTOH, the world is about to become more interesting,
http://www.hexus.net/content/item.php?item=5692
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Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz4.htm
