As quantum computing advances, will blockchains need QPUs for performance to survive the post-quantum era.
According to Quranium’s latest Quantum Computing – State of Play 2025 report, quantum technology has entered a decisive transition phase, where hardware stability, error-correction progress, and hybrid integration are converging with geopolitical and commercial priorities.
For long-lived digital infrastructure such as blockchains, this shift raises a critical question: will future networks need access to quantum processing units (QPUs) to remain viable?
The report frames quantum’s evolution through the concept of a “three-processor universe”. In this emerging compute stack, CPUs orchestrate workflows, GPUs accelerate classical parallel computation, and QPUs address quantum-native problems that scale exponentially on classical machines.
Progress is no longer defined by qubit counts alone, but by multi-dimensional metrics such as coherence time, error rates, and the ability to integrate with existing systems. As hybrid computing becomes the default model, blockchains are unlikely to remain isolated from this architecture.
Cryptographic proof generation has been identified as one of the natural candidates for eventual QPU integration. While today’s zero-knowledge proof systems rely heavily on GPU acceleration, the report notes that the most algebraically intensive components could, in theory, benefit from quantum speed-ups. Over time, QPUs may emerge as specialised co-processors for proof systems rather than replacements for existing validator infrastructure.
Another potential application lies in on-chain optimisation. As blockchain ecosystems grow more complex, validators or specialised off-chain services could call on QPUs to solve optimisation problems such as maximal extractable value mitigation, and cross-chain rebalancing. In these models, quantum computation would be used to generate results that are then committed back to the chain, rather than executed directly on it.
The report also highlights early experimentation with quantum-native blockchain designs. Research efforts such as D-Wave’s proposed Proof of Quantum Work architecture and BTQ Technologies’ photonic sampling-based Q-PoW simulator explore how quantum computation might be integrated directly into consensus mechanisms.
At the same time, the report underscores a fundamental paradox. The same quantum capabilities that could accelerate blockchain performance also threaten its security. A sufficiently powerful, fault-tolerant quantum computer running Shor’s algorithm could break the public-key cryptography that secures most existing networks. As a result, the transition to post-quantum cryptography is described as mandatory rather than optional.
The report’s conclusion is clear: blockchains will not run on QPUs, but future networks will increasingly need to operate in environments where QPUs are available. Blockchains that begin adapting architectures, cryptography, and tooling now are likely to avoid the compounding risks and costs associated with delayed transition.
Read the full report here.
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