Google's Quantum Breakthrough Sparks New Concerns Over Bitcoin and Encryption Security

A newly published scientific paper by Google's quantum research team is raising fresh alarms about the future of Bitcoin and internet security

A newly published scientific paper by Google’s quantum research team is raising fresh alarms about the future of Bitcoin and internet security, signaling that quantum computers may be much closer than previously thought to breaking current encryption systems.

The paper, written by Google researcher Craig Gidney and detailing the company’s latest progress in quantum computing, claims that RSA-2048 encryption—used widely in everything from online banking to cryptocurrency wallets—could be broken using quantum computers with just 1 million qubits. This is a significant decrease from the 20 million qubits previously estimated in 2019.

This 20x reduction in required resources, signaled by a new algorithm for modular exponentiation, suggests that quantum threats could emerge years earlier than earlier projections.

“This represents a 20-fold reduction in the number of qubits compared to our previous estimate in 2019, and a three-fold reduction from a 2022 estimate by a team at ETH Zurich,” stated Gidney in his blog post summarizing the findings.

Quantum Leap in Efficiency

This breakthrough is made possible by improvements in both quantum algorithms and error correction. One of the most significant advancements is the doubling in speed of the complex operation known as modular exponential computation, which forms the basis of RSA security. Additionally, a new method called “magic state cultivation” was able to increase task accuracy and reduce quantum resource requirements further.

Moreover, the researchers were able to boost logical qubit density, meaning more usable quantum bits can operate in the same physical space, drastically improving processing capabilities. This density varied between 16 and 64 logical qubits per physical qubit, depending on the specific task and preferred error rate.

The researchers chose to focus on RSA-2048, a commonly used variant of the RSA algorithm with a 2,048-bit modulus. Their analysis indicates that breaking this level of RSA encryption would require approximately 1 million qubits and 10,000 logical T gates for performing modular exponentiation.

What It Means for Bitcoin

While BTC uses elliptic curve cryptography (ECC) instead of RSA, both systems rely on complex mathematical problems that quantum computers are specifically designed to solve. Although Bitcoin’s 256-bit ECC encryption remains largely secure at present, the rapid acceleration of quantum computing tech raises questions about its long-term resilience.

Currently, the most powerful quantum machines, like IBM’s 1,121-qubit Condor and Google’s 53-qubit Sycamore, are still some way off the 1 million mark. But if the development trend continues, experts warn that ECC—including Bitcoin’s core security—could be vulnerable within the next decade.

This finding is significant as it highlights the urgency of preparing for a post-quantum world. Bitcoin developers and cybersecurity experts may soon face one of their biggest challenges yet.