Scaling quantum systems
In order to increase the computational power of quantum computing systems, improvements are needed along two dimensions. One is qubit count; the more qubits you have, the more states can in principle be manipulated and stored. The second is to achieve lower error rates. We need to be able to manipulate the qubit states accurately and perform sequential operations that provide answers, not noise.
Combining these two concepts, we can create a single measure of a quantum computer’s power called quantum volume. Quantum volume measures the relationship between number and quality of qubits, circuit connectivity, and error rates of operations. Building larger systems with lower error rates will lead to discovering the first instances of quantum advantage, or applications where quantum computers can offer a computational advantage for solving real problems.
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