Can a Qubit Miner ASIC device be created and what would its impact be on the mining community? With mining gaining in popularity every day and the raw power of the ASIC devices increasing at a dramatic rate, I wonder what is the next big jump for miners.

Qubits, or quantum bits, have already shown to be extremely fast at calculations.  That makes them seem like a perfect fit for mining bitcoins.

This question is asking if a qubit device can be created for mining bitcoins and, if so, how it would affect the current mining community using standard zeros and ones.  To ask this another way... 

How much faster would a qubit device mine bitcoins when compared to an existing ASIC device today?  Let's compare it to ButterflyLab's Mini Rig which runs at 500 GH/s.  Ten, hundreds, thousands, millions times faster?  Could quibit devices destroy the bitcoin network by controlling more than 51% of the network?
The best thing I can imagine is running Grover's algorithm, which speeds up what would be an exhaustive search for a single solution among N input values to take only about the square root of N actual evaluations. Only very special problems, like factoring numbers, have better known quantum algorithms.

If you imagine connecting a hypothetical quantum computer to a mining pool, the impact would be low: The quantum computer can only be run on the share of work it gets, which means finding if any of 2^32 nonce values yield a proof of work. An ASIC miner could probably do that in less than a second using (internally and highly parallelized) something like 2^32 operations, each of which includes several 32-bit additions. The quantum computer could get away with doing about 2^16 equivalent quantum operations, which, after serializing the bit operations of the additions, likely means many thousand times 2^16 consecutive qubit operations. And it will require on the order of a thousand qubits, at least. Sounds to me like in this scheme a quantum computer might, at best, be equivalent to a hundred ASICs or so.

But it might just get interesting if we move more of the mining algorithm onto our hypothetical quantum computer. If the extra nonce can be incorporated into the Grover algorithm, a larger search can be performed, with a correspondingly larger speed-up. Unfortunately, a much larger quantum computer running a much more complicated program would be needed. Or let us say fortunately for whoever might otherwise worry about mining competition!