IQM benchmarks chip on the road to 150 qubit quantum computer

IQM benchmarks chip on the road to 150 qubit quantum computer

Technology News |
By Nick Flaherty

IQM Quantum Computers in Finland has benchmarked its 20qubit processor as it looks to produce a 150 qubit machine.

The benchmarks for its 20qubit processor are a key step for the 150qubit quantum computer under development for 2025, says Dr. Juha Hassel, Head of Engineering and Development at IQM Quantum Computers.

The recent advances were achieved by bringing together key technology building blocks, including the Quantum Processing Units (QPUs) fabricated at IQM’s quantum chip fabrication facility in Finland.

The chip is based on IQM’s tunable-coupler concept, enabling fast two-qubit gate speed and state-of-the-art fidelity. Integrated with in-house-developed high-quality control electronics, the 20-qubit processor demonstrates a median two-qubit (CZ) gate fidelity of 99.51% across 30 qubit pairs, with maximum fidelity over a single pair reaching as high as 99.8%.

Among the system-level benchmarks IQM obtained a quantum volume (QV) of 2^5=32. This is a benchmark that ties together scale (number of qubits) and quality (gate fidelity) into one number and measures the largest “square shaped” random circuit that can be computed successfully. To improve on the metric means simultaneously having enough qubits and pushing the gate fidelity.

The Circuit Layer Operations Per Second (CLOPS) of 2600 is based on the same random circuits as QV, but it measures the throughput speed of the quantum computer.

The 20-qubit GHZ state with fidelity greater than 0.5. This is a measure of the entangled state of many qubits. Achieving a GHZ state fidelity greater than 0.5 shows that some genuine multiqubit entanglement present in the system.

All of this leads to a Q-score of 11 for the system performance on Max-Cut, a real combinatorial optimization task, indicating up to which scale the problem can be solved using the quantum computer.

“This is clear evidence of the functionality and quality of our technology, laying the groundwork for our mission to build quantum computers,” said Hassel.

“We are already working with prototype systems up to 150 qubits, and the learnings from the smaller systems provide valuable validation of the basic technology choices. We want our end-users to have a system that delivers high performance to provide maximum value,” he added.

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