Bauman’s 8-qubit SnowDrop reaches 99.55% accuracy

Image: Bauman Moscow State Technical University

Bauman Moscow State Technical University and the Dukhov All-Russian Research Institute of Automation will open remote access to the 8-qubit superconducting SnowDrop 8Q on August 1, 2026. The processor will be available through the Bauman Octillion cloud platform, while access to the earlier 4-qubit version will remain in place.

The headline performance figure is 99.55% accuracy for the best-performing qubit pairs. That result comes from a broader set of test measurements: average single-qubit operation accuracy reached 99.929%, while two-qubit operations averaged 99.26%.

What changed in SnowDrop 8Q

The new processor is based on the previous 4-qubit design, but its architecture has been revised. Project leader Ilya Rodionov said the engineering team changed the chip’s topology and the control scheme governing interactions between its computing elements.

Instead of a conventional approach, SnowDrop uses bipolar BAT pulses. The developers say the signal format should improve resistance to interference and make system tuning easier. The new control signals also reduce the number of operations required inside algorithms, which can conserve processor resources and lower the risk of errors.

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Those changes target the part of superconducting quantum systems that is often hardest to manage: two-qubit operations. As a result, the project is emphasizing operational accuracy and control stability rather than simply increasing the number of qubits.

Key SnowDrop 8Q specifications include:

• 8 qubits;
• 99.929% average accuracy for single-qubit operations;
• 99.26% average accuracy for two-qubit operations;
• 99.55% accuracy for the best qubit pairs;
• Continued access to the 4-qubit version.

Cloud access and the 105-qubit comparison

SnowDrop 8Q is being prepared specifically for remote use through Bauman Octillion. That model could allow universities, laboratories, and companies to run experiments and quantum algorithms without operating their own quantum hardware.

The announcement comes as other countries expand cloud-accessible quantum systems. In late 2025, China announced the commercial readiness of a 105-qubit machine, putting it well ahead of SnowDrop 8Q in raw qubit count.

The comparison is not limited to chip size, however. For superconducting processors, operation accuracy and control stability can be as important as the total number of qubits. The Russian developers' mathematical modeling suggests that scaling could eventually push accuracy above 99.9%, but the source does not say when that milestone could be reached or provide independent verification of the projection.

The source also gives no pricing for Bauman Octillion access. Its concrete availability detail is the planned opening date: August 1, 2026.