The performance of a quantum computer is typically measured using various benchmarks that assess its capabilities. However, it's important to note that quantum computers are still in the early stages of development and have not yet reached a level of maturity comparable to classical computers. As a result, benchmark scores for quantum computers can vary significantly depending on factors such as the specific quantum hardware being used, the algorithm being executed, and the problem size.
One common benchmark used for quantum computers is quantum volume. Quantum volume takes into account various aspects of a quantum computer's performance, including the number of qubits, gate error rates, and measurement error rates. It provides a single numerical value that represents the effective computational power of the quantum computer.
the highest quantum volume achieved was around 128 by IBM. However, it's important to note that this value is likely to increase as quantum technology advances.
It's worth mentioning that quantum computers excel in certain types of computations, such as factoring large numbers or simulating quantum systems, where they can potentially offer exponential speedup compared to classical computers. However, quantum computers are not faster for all types of computations, and their performance depends on the specific problem being solved and the algorithm employed.
As quantum computing technology progresses, it is expected that benchmark scores will continue to improve, but predicting a specific score for a future quantum computer would be speculative.