Can someone here give a quick explanation on how this would work? Assuming that everything is stored as qubits and that their internal state is used as a way t

Can someone here give a quick explanation on how this would work? Assuming that everything is stored as qubits and that their internal state is used as a way to increase storage (and they found a way to make the internal state not change over time), wouldn't reading from disk destroy this internal state (not to mention give a random output)? Have they found a way to measure a qubit in some way without possible loss of information?