Entwine Labs Challenge 2025¶
⚠️ This event is now closed.
Congratulations to all participants and to the winners of the Entropica Labs Challenge 2025!
About the Challenge¶
The Entropica Labs Challenge 2025 was a global competition focused on quantum error correction, lattice surgery, and surface code engineering.
Participants used Entwine and Loom to design, simulate, and validate innovative lattice surgery protocols and logical qubit architectures.
The goal of the challenge was to explore how visual design tools and programmatic frameworks can work together to advance quantum code design and automation.
Winners¶
🎉 Congratulations again to our winners and finalists!
Their projects demonstrated exceptional mastery of Entwine and Loom, showcasing innovative designs and deep understanding of lattice surgery.
1st Place – QEC Architect - S$1,500 Cash Prize
Tom Peham, Doctoral Student at the Technical University of Munich, Germany Tom showed the masterful use of ZX calculus to simplify the circuits in task 2 and 3, and to obtain the lattice surgery circuit in a straightforward manner. In task 2, his circuit used 3 frames (timesteps in Entwine), and a total spatial footprint of 2 by 4 logical qubits. For task 3, his circuit used 6 frames and a total spatial footprint of 6 by 6 logical qubits. Amongst all submissions, Tom’s solutions had one of the smallest circuits, thus putting himself in the top spot.
2nd Place – QEC Artisan - S$1,000 Cash Prize
Aristomenis Zazanis, Prospective Doctoral Student, United Kingdom Aristomenis saw that the circuit in task 2 could be much simplified by looking at the output state. His solution in task 2 had a total spatial footprint of 4 by 4 logical qubits, and used 21 timesteps to achieve the final state. The relatively high timestep-count was due to the direct translation of logical CNOT gates into lattice surgery sequences, not seeing that a part of the circuit was simply a logical 4-qubit GHZ state, which could have been created in a simpler way. In task 3, his solution had a total spatial footprint of 7 by 7 logical qubits and used 17 frames. His solution leveraged on parallelising lattice surgery actions into the same frame, while still ensuring that “clashes” do not occur.
3rd Place – QEC Explorer - S$500 Cash Prize
Davide Laureti, Student, Italy Davide explained his thought process clearly and gave a detailed breakdown of the resources consumed by these lattice surgery circuits for the tasks. He translated all the logical gates directly into lattice surgery sequences. In task 2, his circuit used 41 frames, and a total spatial footprint of 7 by 7 logical qubits. In task 3, his circuit used 104 frames, and a total spatial footprint of 2 by 10 logical qubits. While Davide’s solution had one of the largest resource consumption amongst all submissions, his circuits were correct. For task 3, by recognising that the patches for the 9 data qubits of the surfaces could be placed in a line to facilitate the lattice surgery sequences for the logical CNOT gates, he was able to cut down some of qubit usage.
Honourable Mention: Tim Chan, Quantum Computing DPhil Student, United Kingdom Tim had the best solution for Task 2. He implemented the algorithm in arXiv:2401.15829, creating a solution that could, in-principle, solve any logical Clifford circuit. His implemented code found a solution that used 3 frames (!) but had a total spatial footprint of 6 by 6 logical qubits. Tim was also able to find a good plan of action for Task 3, but was unable to make it work in Entwine.
Stay Tuned¶
While the 2025 Challenge has concluded, the spirit of exploration continues.
Future challenges and community events will keep pushing the frontier of quantum code design.
To stay updated, follow Entropica Labs and check back on Entwine for new features, tutorials, and announcements.