# Superconducting quantum heat engine paves way for large-scale quantum computers

Finnish scientists have developed the first cyclic quantum heat engine operating in the quantum realm.

- **Source:** [Latest Science News -- ScienceDaily](https://brifing.si/source/0eef8637-6c5b-4e79-8f5b-6c9c6b36cf16)
- **Published:** 2026-08-14
- **Topic:** [Data & AI](https://brifing.si/c/data-ai)
- **Original article:** <https://www.sciencedaily.com/releases/2026/08/260814011041.htm>
- **On Brifing:** https://brifing.si/s/a593c78a-e43c-4eea-a86a-7fb259869c67

## Convergence of quantum and thermodynamics

Researchers at Aalto University have developed the first cyclic quantum heat engine that combines quantum mechanics with thermodynamics. The engine integrates a transmon qubit, resonator, and quantum refrigerator into a superconducting circuit. This breakthrough provides crucial insights into how quantum effects like tunneling, entanglement, and superposition influence thermodynamic processes.

## Quantum version of Otto cycle

The team successfully reproduced the Otto cycle - commonly used in car engines - within a superconducting circuit. Operating near -273°C, the system can both heat and cool using a quantum refrigerator. Through precisely timed control pulses, the engine monitored qubit state changes and successfully produced positive work output.

## Technical innovations

The system's key innovation is using a single quantum refrigerator as both hot and cold environments. This approach offers a simpler and more versatile design compared to conventional heat engines. Published in Nature Communications, the study demonstrated measurable work conversion from heat passing through the qubit.

## Implications for quantum computing

This technology could help overcome major scalability challenges for quantum computers. Finland's 2035 goal of a 1000-logical-qubit computer would require hundreds of thousands of physical qubits. Current technology needs millions of microwave cables costing thousands of euros each. Autonomous devices could largely eliminate this cable requirement.

## Cost and noise advantages

Microwave cables not only increase costs but also introduce noise into quantum systems. Autonomous quantum heat engines could solve both problems simultaneously by reducing hardware costs and system noise. This becomes increasingly critical as qubit counts grow.

## Next development steps

The research team now focuses on refining the design to create fully autonomous heat engines. These could eliminate the need to transport microwave pulses from millikelvin temperatures to room temperature when reading qubits, potentially improving quantum computer scalability and reliability.

## Finland's quantum strategy

Conducted at Finland's OtaNano infrastructure, this experiment demonstrates the country's quantum technology ambitions. Supported by the Finnish Cultural Foundation and Research Council of Finland, the project aligns with Finland's goal of building a 1000-logical-qubit computer by 2035, requiring efficient management of hundreds of thousands of physical qubits.

## Scientific impact

This achievement marks an important milestone in quantum thermodynamics. It provides a new platform to study the intersection of quantum technologies and classical thermodynamic principles while offering concrete engineering solutions for practical quantum computing applications.

## Sources covering this story

- https://www.sciencedaily.com/releases/2026/08/260814011041.htm — 

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_Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._