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There are big picture challenges that stand between us and practical computing. Issues such as whether we can design the most advanced qubits to connect the errors we need, and how we design the governments necessary to perform global computations on those logical targets. But there are also many less obvious problems that need to be resolved before we read on.
One of the problems that only affects certain types of hardware, is control. In the devices we design, such as superconducting qubits, there are always subtle differences between individual qubits. (This is not true when we use an object like an atom to hold a qubit, but the lasers that control it can move.) As a result, this hardware is put through a process called calibration, where we test different frequencies and amplitudes of the microwave pulses that control it to find the combination that produces the least error, and then save the changes to be used in the calculator.
However, you cannot change the way you are reading, which means that driving becomes a problem for a long time and is difficult. Google, however, has found that it is possible to improve by using the data used to correct errors.
