Similarly: What are a qubit's specs? I would like to be able to think about what class of problem would be trivial with a quantum computer.
Then what you should be asking is "which problems are in BQP?" (if you just want a summary of the high level capabilities that have been proved so far), or "how do quantum circuits work?" (if you want to know what role individual qubits play). I don't think there's any meaningful answer to "a qubit's specs" short of a tutorial in the aforementioned topics. Here is one such tutorial I recommend.
This is a thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. The previous thread is at close to 500 comments.