Qubit (Qdit) equivalence with bits/bytes/Kbytes/ What is the conversion factor for qubits (qudits) to bits/bytes in classical information theory/computation theory?
I mean, how can we know  how many "bits/bytes" process, e.g., a 60 qubit quantum computer (quamputer), are equivalent to classical bits (dits)?What about memories and velocities in "attaniable" quantum computers versus classical current memories and computer velocities(GHz)?
 A: Qubit (Qudit) equivalence with classical bits:
$1 \; qubit=2\; classical\; bits$ and $1 \; qudit=D\; classical\; dits $
$N \; qubits=2^N\; classical\; bits$ and $N \; qudit=D^N\; classical\; dits $
As 1 byte= 8 bits=$2^8\;bits$, or $1\;bit= 2^{-3}\;bytes=0.125\;bytes$, we have also
$N \; qubits=2^{N-3}\; classical\; bytes$ and $N \; qudytes=D^{N-3}\; classical\; dits $
Of course, one could define also the qubyte (8 qubits) and the qudyte avoid the -3 extra exponent and keep parallelism with classical information theory. It is trivial to get the equivalence with kilobytes.
A: The value of a qubit is, in effect, a complex number.  To specify a complex number requires an infinite (and in fact uncountable) number of bits.  So in terms of the information that's stored, a qubit is the equivalent of a large infinite number of bits. 
You cannot, of course, extract all of that information.  As Peter Shor points out in comments, Holevo's Theroem says that you can extract at most one bit.  
A: I think one concept to grasp here is quantum parallelism. GHz refers to how fast a computer does 1 computation (A billionth of a second) and classic computers do 1 computation at a time (or a few in multi-core computers). However in a quantum computer multiple computations can be done at once in parallel. 
Ultimately when you input Qubits into a system they are identical to regular bits... and when you measure the Qubits they are the same as bits... the interesting property about Qubits is the algorithms you can perform on them because of the quantum properties (assuming you can bring them back to a form where the measured results become useful bits).
