This critical question is at the heart of 2026’s scientific debate. A "cryptographically relevant" quantum computer - capable of running Shor’s algorithm to break Bitcoin, Ethereum, or secure web protocols - would need thousands of reliable, error-corrected (logical) qubits and the ability to perform tens of millions (or more) quantum logic operations sequentially without failure.
Key Takeaways
- The largest quantum computers today have only a few hundred physical qubits - not enough for cryptographic attacks.
- Attacking widely used schemes like secp256k1 is believed to require at least 1,200-1,450 logical qubits and 70-90 million Toffoli gates, depending on the quantum circuit.
What Does That Mean in Practice?
Given physical error rates and hardware limitations, achieving enough logical qubits could require up to several million physical qubits - orders of magnitude beyond today’s best systems. Progress in hardware and error correction will close this gap, but it will take time and significant research advances.
What Do the Experts Say?
The 2026 research from Google Quantum AI, Stanford, Ethereum Foundation, and Berkeley affirms that no known system is close to this scale today - yet resource estimates serve as a roadmap for what must be overcome to reach quantum-cryptographically relevance.
Why This Matters for Digital Ownership and Sovereignty
Quantum progress is a new test of digital sovereignty: it puts the foundational assumptions of digital asset ownership, blockchain systems, and cryptographic security under a spotlight. The best protection is awareness and ongoing adaptation, not fear.
Why This Matters to Tsuka
Tsuka’s approach embodies monitoring, verification, and education. The quantum transition is not a reason for panic, but for evidence-backed vigilance, transparency, and technological resilience.
About Tsuka
Tsuka develops educational resources on digital sovereignty, cryptography, and technologies at the intersection of human agency and security. The focus is on empowering people to adapt as technology progresses.
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