Quantinuum has announced that its System Model H2 has achieved a Quantum Volume (QV) of 225, or 33,554,432. This represents a 4x improvement since the company reached a QV of 8 million in May 2025. Quantinuum has led in this key performance benchmark since 2021.
The QV test is a system-level benchmark that is sensitive to qubit number, fidelity, and connectivity. It requires a set of test circuits to be run on a quantum computer and then compared to a classical simulation of the ideal circuit. The test is passed if the average heavy output probability (HOP) over a set of circuits is above 2/3 with two-sigma confidence. The company’s upcoming Helios system, which is scheduled to come online later this year, is expected to take performance to a new level.
The achievement is credited to Quantinuum’s hardware and the team behind it. Jennifer Strabley, an executive at Quantinuum, commented on the large margin of the achievement. Quantum Volume is a benchmark for system performance that demands all parts of the system work together to generate the results. The company’s GHZ state fidelity benchmark, which measures the ability of a system to create large, entangled states, is also a key measure of performance.
Read the full announcement in the Quantinuum LinkedIn post here and the Jennifer Strabley LinkedIn post here. For more details on the GHZ benchmark, see the Quantinuum documentation here.
September 18, 2025
Leave A Comment