Most digital communications are secured by encryption built on mathematical problems so hard that conventional computers cannot realistically solve them. That assumption could soon be broken by quantum computers that exploit properties of matter at subatomic scales to perform certain calculations far more efficiently than conventional machines ever could.
Such systems may be capable of breaking widely used encryption methods considerably sooner than researchers had expected. Recent results from 2026 have raised concerns about quantum-based security issues in digital spaces.
IBM has built a 120-qubit processor targeting quantum advantage on certain tasks, with a fully fault-tolerant machine on its roadmap for 2029. Google is moving to accelerate its own adoption of quantum-resistant encryption. Newer entrants are also making progress: one company is developing processors from photonic components using conventional semiconductor fabrication methods.
Laboratory work with neutral-atom platforms has separately achieved precise management of several thousand qubits at once. This suggests practical scale-up may be closer than dominant hardware approaches alone imply.
Two studies from March 2026 have significantly revised downward the quantum resources estimated necessary for breaking real-world cryptography. Google’s Quantum AI team concluded that elliptic curve encryption could be attacked by a system operating with under 500,000 physical qubits.
That is roughly an order of magnitude below what earlier analyses had projected. A separate Caltech-Berkeley collaboration estimated that roughly 26,000 atomic qubits could break Bitcoin’s encryption within days. Foundational attack algorithms may be executable on systems of just 10,000 to 20,000 qubits.
Exposure is not uniform across different encryption standards. Systems relying on elliptic curve mathematics, which underpins Bitcoin, Ethereum, and many secure protocols, are most immediately in the researchers’ crosshairs. RSA encryption depends on the computational difficulty of factoring very large numbers and demands considerably more quantum capability to crack.
It faces the same long-term pressure nonetheless. Google’s research singles out blockchain platforms as particularly urgent candidates for cryptographic modernization before quantum hardware reaches the necessary threshold.
The U.S. National Institute of Standards and Technology has certified a set of post-quantum cryptographic algorithms. Agency guidance calls for migration away from vulnerable systems to be substantially complete by 2035. Australia’s equivalent agency has set 2030 as its deadline and is pressing organizations to start the process now.
Google Chrome and Cloudflare have both begun integrating quantum-resistant protections into selected protocols, operating alongside existing encryption in hybrid arrangements.
Progress on both the hardware and algorithmic fronts means the timeline is compressing steadily. Every advance that reduces the qubit count or processing overhead required to mount a successful attack brings practical quantum attacks incrementally closer to feasibility.
Industries and governments with the most to lose from an encryption breach have a strong incentive to act now. Accelerating the shift to quantum-resistant alternatives is considerably safer than waiting for the threat to arrive. As D-Wave Quantum Inc. (NYSE: QBTS) and other leading firms within the quantum computing space advance their R&D programs, the writing is on the wall: quantum computing is here, and organizations need to prepare accordingly.
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