Constructing a functional machine that has a large number of qubits isolated well enough to have such a low error rate is a daunting task that physicists are far from achieving.

• 可以运作的量子电脑需要含有大量的量子位元，而每个量子位元与环境的隔离必须好到让错误率如前述的那样低，建造这样的量子电脑是极困难的工作，物理学家距离成功还很遥远。