Launching Bittensor's First Quantum Subnet

On Monday July 7th, qBitTensor Labs launched Bittensor's first quantum subnet, aptly named "Quantum," on Subnet 63.

qBitTensor Labs is a company built at the intersection of quantum computing, AI, and decentralized networks. Our mission is to leverage Bittensor's decentralized incentive layer to advance quantum computing — making one of the world's most powerful and scarce resources accessible to everyone.

The 3-Phase Roadmap

Phase 1: Provable Accuracy — The first challenge uses peaked circuits, based on Aaronson & Zhang's 2024 paper. Peaked circuits are quantum circuits specifically designed so that ideal quantum computers produce a characteristic "peaked" output distribution, while classical computers cannot efficiently reproduce this distribution. This creates a provable, verifiable benchmark for genuine quantum computation.

Phase 2: Synthesized Real-World Problems — Building on the peaked circuits foundation, we move to challenges that represent synthesized versions of real-world computational problems that quantum computers may have advantages in solving.

Phase 3: Open Quantum Platform — The ultimate vision: a decentralized marketplace for quantum computing where researchers, students, and enterprises can access quantum processing units (QPUs) through Bittensor's incentive layer.

How It Works

Miners (quantum computer operators) compete to solve challenges. The subnet validates solutions on-chain, and miners earn $TAO rewards proportional to their performance. Speed wins — and harder challenges earn more alpha.

The difficulty scaling function parameterizes challenges from 0 to 5, with qubit counts scaling as N = floor(10 × log₂(d + 3.9) + 12). This means the easiest challenges use ~12 qubits while the hardest push beyond 40 — well into the regime where classical simulation becomes intractable.